Image source, Ukraine government

In his nightly Facebook address, Ukraine's President Volodymyr Zelensky argues that the country has struck "powerful blows" to invading forces.

"Over the past week, our heroic Armed Forces have dealt powerful blows to the enemy. Significant losses," he says. He said 16,000 Russian troops had been killed, but Russia says 1,351 have died.

"They say that the Minister of Defence of Russia has disappeared somewhere," Zelensky adds, referring to the reported disappearance of Russian Minister of Defense Sergei Shoigu, who has not been seen in public since 11 March.

Shoigu did, however, appear for a few seconds on Thursday after a nearly two-week absence in a televised meeting Putin was holding with government ministers.

"I am grateful to our defenders who showed the occupiers that the sea will not be calm for them even when there is no storm. Because there will be fire," Zelensky added ominously.

"By restraining Russia's actions, our defenders are leading the Russian leadership to a simple and logical idea: talk is necessary. Meaningful. Urgent. Fair. For the sake of the result, not for the sake of the delay."

Zelensky added that the suffering in Mariupol is worsening, as tens of thousands of people are trapped without food, water or heat.

"The situation in the city remains tragic. Absolutely tragic. The Russian military does not allow any humanitarian aid into the city," said Zelensky.

Image source, Getty Images

A senior US defence official has just given a briefing from Warsaw, where President Joe Biden has been speaking to American troops stationed in Poland.

As we reported earlier, the official - who briefed reporters on condition of anonymity - argued that Ukrainian forces could retake Kherson, the southern city captured by Russia in the first days of the war.

Here are some other key points:

• Russia has conducted 1,250 missile launches in the first 30 days of the war
• Russia has increased its aerial sorties in recent weeks, now flying an average of 300 per day
• US officials confirm Ukraine's claim that it destroyed a ship transporting Russian tanks in the occupied port city of Berdyansk
• Troops around Kyiv are digging in, and do not appear to be preparing for a ground assault on the capital
• Makariv, a suburb west of Kyiv, is also now heavily contested by both sides
• Russian troops are making no progress in their attacks on Kharkiv, in the north
• Russian troops are stationed around 15km outside of Mykolaiv, a city near Kherson, and are trying to close the city off to resupply from Ukraine
• Putin's troops managed to break through a Ukrainian defence near Izyum, and have moved south towards the Donbas territory

Hanna Chornous
BBC News, Kyiv

Young people are leisurely chatting by a hipster coffee shop in central Kyiv.

It's one of many places with excellent coffee, something the city has become known for in recent years. A group of friends are playing table tennis nearby in the afternoon sun.

"We have reopened and are going to keep working as long as we can," barista Mykola tells us. "We are doing this to make people smile."

The Kashtan café where he is working is one of the places serving customers still staying in the city.

"Death to the Russian invaders. Coffee for defenders is free," a sign at another coffee place says. Not charging the military or territorial defence fighters is a common practice.

Many Kyiv trendy restaurants and cafes have turned into field kitchens, cooking thousands of free meals for the city defenders or people in need.

Some serve customers too, in attempt to bring a sense of normality to the residents, operating limited hours to respect the daily curfew. The Kyiv authorities have put together a map of cafes and other businesses now open.

As we leave, with our flat whites in hand, dull thuds of explosions are heard in the distance. A grim reminder that Kyiv is still very much a city in wartime.

Image source, Reuters

In Warsaw thousands of people have been at a demonstration in support of Ukraine, timed to coincide with US President Joe Biden's visit to Poland.

More than 2.2 million Ukrainians have fled the war to Poland.

Image source, Reuters

Jailed Russian opposition leader Alexei Navalny is in good spirits and working hard to counter Kremlin war propaganda, his chief-of-staff tells the BBC.

Leonid Volkov says he received a note from Navalny today and his lawyers visit him nearly every day.

"He isn’t desperate, his moral condition is very good and he is very actively involved in the work the Anti-Corruption Foundation is doing to reach more Russians with counter-propaganda," Volkov said.

Navalny - whose sentence was recently extended by nine years - was working to "increase the cost of this war to Vladimir Putin", Volkov added.

The opposition leader has called on Russians to demonstrate against the war. Thousands of demonstrators have been detained in Russia.

Read more - Alexei Navalny: Russia's jailed vociferous Putin critic

Image source, Reuters

If you are just joining our live coverage, or want a recap, here is a summary of some of the key developments:

• Russia says the first phase of the war is over and it will now focus on the "complete liberation" of the eastern Donbas region
• Western officials believe this implies that Moscow knows its pre-war strategy has failed
• French leader Emmanuel Macron says France, Greece and Turkey are trying to organise an evacuation of civilians from the besieged port city of Mariupol and he will discuss this with Putin
• An official in Mariupol says 300 people were killed in last week's bombing of a theatre where people were sheltering
• The Pentagon says Kherson - the first city to be occupied by the Russian army - is now contested and Ukrainian forces are trying to retake it
• Russia's defence ministry has given an update on its military casualties, external for only the second time - it says 1,351 of its soldiers have been killed, a figure far lower than Ukrainian and Western estimates
• And author JK Rowling has hit back at Vladimir Putin after he cited her in a wide-ranging speech that saw him criticise "cancel culture"

Read more - Ukraine daily round-up: Russia says first phase over as Biden visits Poland

Image source, Reuters

French President Emmanuel Macron has said there is no reason to accept a demand from Russia to pay up in roubles for Russian gas.

Europe is attempting to reduce its reliance on Russian gas due to the invasion of Ukraine.

Earlier this week, Russian President Vladimir Putin said that he wanted "unfriendly" countries to buy its gas with roubles. The move is understood to be aimed at boosting the Russian currency, which has lost over 20% in value this year.

"All the texts that have been signed are clear. This is forbidden," Macron told a news conference after a European Union summit in Brussels.

"European firms that buy gas and which are operating on European territory have to do so in euros. Therefore it is not possible today to do what is being demanded, it is not contractual," added Macron.

Caroline Davies
BBC Moscow Correspondent

Image source, Sota

Dmitry Reznikov is a 22-year-old student in Moscow. He was detained on 13 March for holding up a sign with no words, only asterisks. He was fined 50,000 roubles (about £380) for discrediting Russia's armed forces.

"I made the decision to do it on an impulse," Reznikov says. "I knew it doesn’t matter what is written on the sign, it could have been blank, we've seen people arrested for that before. Everyone understands what this sign is about and what side it expresses."

He adds, "It's important that people shouldn't stay silent if they agree that what is going on is terrible, they should express their opinion."

Reznikov tells me: "The main reason I did it is because there is no justification for this conflict. Civilians and soldiers are dying. I wasn’t trying to discredit the army."

The 22-year-old has been detained twice since the start of the conflict. He used to protest before what is being described here as President Putin's special military operation, but says, "Now I am far more afraid to do it. There’s more repression and criminal prosecutions."

Reznikov says he doesn't know what will happen next in Russia. "I hope the conflict will stop, that no more people will die."

The Foreign Office has apologised after mistakenly sharing the email addresses of dozens of people who were living in Ukraine and seeking refuge in the UK.

It failed to hide recipients' emails when it sent out a mass email asking those seeking help whether they had managed to leave Ukraine.

The email was sent to 42 recipients on 20 March.

BBC Radio 4's PM programme was alerted to the breach by Sam who left Kyiv with his partner having first sought Foreign Office advice.

He said it was a "huge security risk" that could see them targeted by Russia.

"I would say we have had a weak form of generic apology, with ... no action, no real formal apology, no real public apology. Nothing that is putting my mind at rest," he said.

The Foreign Office suggestion to "maybe try looking out for any spam emails" was "weak and woefully inadequate", he said.

Last year the Ministry of Defence twice mistakenly shared the email addresses of Afghans who wanted to relocate to the UK as the Taliban were taking over the country.

French President Emmanuel Macron has said he's working with Turkey and Greece on plans for a "humanitarian operation" to evacuate people from the devastated southern city of Mariupol.

He said he hoped to speak to Russia's President Putin "within the next 48 to 72 hours" regarding the planned initiative.

The port city of Mariupol lies in ruins after relentless Russian shelling. Tens of thousands remain trapped inside, with little access to food, water, electricity or gas.

Macron told reporters there was a "concrete" discussion today with the mayor of Mariupol. "We are coordinating and we will then negotiate with the Russians," he said.

Earlier, an official told the BBC that an estimated 300 people had died in last week's attack on a theatre in the city, where civilians had been sheltering.

A total of 7,331 people were evacuated from Ukrainian cities through humanitarian corridors today, a senior official said.

This is more than double the 3,343 who managed to escape on Thursday.

Deputy Prime Minister Iryna Vereshchuk said in an online post that 2,800 people had left the besieged city of Mariupol using private transport.

Frank Gardner
BBC Security Correspondent

Nato leaders have been growing increasingly concerned that Russia, faced with something of a military stalemate in much of its campaign in Ukraine, could be preparing to launch a chemical attack in order to break the deadlock. There is no published evidence on the ground to back this up but President Biden has warned that Nato would respond to a chemical attack "in kind".

So what does that mean exactly? Well it does not mean a Nato chemical attack in response. Jake Sullivan, the US National Security Adviser, made that clear on Friday when he said the US would not use chemical weapons under any circumstance. Both the US and Russia are signatories to the 1997 Chemical Weapons Convention, an international treaty outlawing these horrific weapons, also signed by 191 other nations.

Russia is supposed to have destroyed all its chemical weapons stocks by 2017. But the following year it was blamed for the poisoning in Salisbury of former KGB officer Sergei Skripal and his daughter using the nerve agent Novichok smeared onto their front door. This is why President Biden has said Russia has used chemical weapons before.

Even if Russia has secretly held back some stocks of poison gas or liquid nerve agent, which it has not admitted to, it is unlikely to be in a position to use this on a mass scale on the battlefield in Ukraine.

Instead, experts believe, the most likely risk is that Russian forces could attempt a deliberate release of toxic industrial chemicals like chlorine from existing Ukrainian factories. This could have a devastating effect on civilians living in a built-up area and in the fog and confusion of war it may not be immediately clear who was responsible. A recent release of ammonia gas was deemed to be accidental.

If such a blurred line existed it might be hard for Nato countries to reach a unanimous decision on how harshly they should respond.

Image source, Getty Images

Kherson, the southern Ukrainian city that was the first major population centre captured at the start of the war, is "contested territory again," a US defence official has told journalists.

If the city, which is relatively close to the Crimean peninsula, were to be retaken by Ukraine, it would represent a major setback for Russia's offensive.

Russia's military has disputed that it has lost control of Kherson, and Ukrainians on the ground there have not reported that it has been recaptured.

"The Ukrainians are trying to take Kherson back, and we would argue that Kherson is actually contested territory again," the Pentagon official told reporters on Friday.

"We can't corroborate exactly who is in control of Kherson but the point is, it doesn't appear to be as solidly in Russian control as it was before," added the official, who was speaking on condition of anonymity.

Fighting is ongoing in the larger region of Kherson Oblast, according to the latest reports, as Russia continues to focus its efforts on taking the southern Black Sea coast.

Image source, AFP via Getty Images

Global police organisation Interpol has sent a team to Moldova amid human trafficking concerns as the country deals with a huge surge in refugees fleeing Ukraine.

Since the start of Russia's invasion, almost 380,000 Ukrainians have fled into neighbouring Moldova, which has a population of 2.6 million and is one of the poorest countries in Europe.

The Interpol team will be deployed in the capital Chisinau and different refugee camps, it said in a statement.

The agency has already received reports of human traffickers and smugglers waiting at border checkpoints to prey on "vulnerable" Ukrainians, it said.

"Children and unaccompanied minors are especially vulnerable to exploitation by smugglers and traffickers," Interpol warned.

Former Russian MP Ilya Ponomarev, a long standing Putin critic, tells the BBC's Hardtalk programme that the Russian president has started "an imperialist war" in Ukraine that could rip Russia apart.

Jeremy Bowen
BBC News, Irpin

Smoke as heavy as a winter fog hung over the last mile or so of the road into Irpin, just a 20-minute drive north-west of Kyiv. Trees and undergrowth in the pine forest on either side were burning, set alight by shelling. The road was almost empty.

When our BBC team was last able to come here, about three weeks ago, the city was badly damaged. Now it is in ruins.

Irpin sits in an arc of towns that also includes Bucha and Hostomel, where the most important fighting for the future of Kyiv is taking place.

Commander Oleg said the Russians had been pushed back. He explained that they were hitting Russian supply lines. Putin's men still had a toehold on the ground in Irpin, but the way they made their presence felt was with heavy artillery.

First-hand reporting helps, but it is still hard to penetrate the fog of war, especially in a place that is being shelled more or less constantly. As far as I could see, the claims made by the Ukrainian military that it is holding territory and even taking some of it back are true.

Read more - Next stop Kyiv: the battle on the capital's outskirts

Ukrainian Foreign Minister Dmytro Kuleba has said peace negotiations with Russia are difficult, and denied reports that progress had been made in resolving four out of six key issues.

It comes after a member of the Russian negotiating team earlier said that the two sides were coming closer to an understanding on secondary issues. Turkish President Tayyip Erdogan was also reported as saying progress had been made in the talks.

But Kuleba said "there is no consensus with Russia on the four points".

"The negotiation process is very difficult," he posted on Facebook. "The Ukrainian delegation has taken a strong position and does not relinquish its demands. We insist, first of all, on a ceasefire, security guarantees and territorial integrity of Ukraine."

Kuleba later tweeted that there was "no consensus in negotiations yet", complaining "Russia sticks to ultimatums".

He added: "To stimulate a more constructive approach we need two things: more sanctions and more military aid for Ukraine."

Image source, Reuters

New satellite photos from Maxar show the part-submerged Russian vessel that was destroyed in the occupied port of Berdyansk on Thursday.

The Ukrainian military said the Saratov, a landing ship, had been hit by its forces. The vessel had previously incorrectly been identified as the Orsk, the military said, adding that two other Russian landing ships had also sustained damage.

The satellite photos taken today shows black smoke continuing to billow from a structure on the port close to several fuel storage tanks.

Image source, Reuters

Kyiv says there has been a Russian missile attack on a military command centre in the central Ukrainian city of Vinnytsia.

Missiles hit several buildings, causing "significant damage to infrastructure", the Ukrainian air force said on Telegram.

Earlier Russia claimed to have almost completely destroyed Ukraine's air force and air defence capability.

A bit random, but Georgia's former leader Mikheil Saakashvili - a pro-Western reformer - has been addressing the longtime Belarus leader Alexander Lukashenko on Twitter.

Belarus is effectively a client state of Russia. Russian troops invaded Ukraine from Belarus territory. However despite speculation Belarusian troops might be called to take part in the war, this has not yet happened.

Saakashvili told Lukashenko that his reign would be over if he sent his own troops into Ukraine.

"Luka, I've never given you bad advice. If you send troops to Ukraine, you will no longer be in power in a month at the most and you will end up very badly. Putin doesn't care about your fate, you know," the Georgian wrote.

Saakashvili himself remains in prison in Georgia. He made a surprise return to the country last year and was then arrested for a conviction he was given in absentia. He says he is a political prisoner.