Germany is to send 1,000 anti-tank weapons and 500 "Stinger" surface-to-air missiles to Ukraine, the government in Berlin confirms.

The move marks a major change from its long-standing policy of banning weapon exports to conflict zones.

"In this situation, it is our duty to support Ukraine to the best of our ability in its defence against Vladimir Putin's invading army," says Chancellor Olaf Scholz.

Refugees are continuing to stream towards Ukraine's borders.

Our correspondent Lucy Williamson is on the frontier with neighbouring Moldova.

Russian commanders are becoming increasingly frustrated by the slow speed of their advance through Ukraine and are starting to face logistical issues, a senior US defence official says.

It appears Moscow did not supply its troops with sufficient fuel, and commanders have been forced to adjust their plans as a result, the official told the Reuters news agency.

Videos on social media on Saturday appeared to show Russian tanks stalling in parts of Ukraine.

You can watch one of the encounters below, which the BBC has geolocated to a highway near Sumy in eastern Ukraine. In the video, a man can be heard offering the apparently stranded soldiers "a tow back to Russia".

Germany has backed imposing ""targeted and functional" restrictions on Russia's membership of the Swift payments system.

"What we need is a targeted and functional restriction of Swift," Foreign Minister Annalena Baerbock and Economy Minister Robert Habeck said in a joint statement.

The government is working on how to "limit the collateral damage" of the restrictions "in such a way that it affects the right people", it added.

Germany is the last EU country to drop opposition to the sanction, after Italy's Prime Minster Mario Draghi and Hungarian leader Victor Orban signalled their support earlier on Saturday.

Ukrainian President Volodymyr Zelensky said he was "grateful" to EU nations for the decision.

Read more: What is Swift and why are leaders divided on banning Russia?

Kawoon Khamoosh
BBC World Service

Image source, FAZILA HAIDARI

Afghans who fled the chaos and fighting after the Taliban took Kabul in August have been telling me of their shock at being caught up in the war in Ukraine.

"The situation of Afghanistan when the Taliban took over was better than what I'm seeing here in Ukraine. We are now escaping again, but this time to an unknown destiny," says Haidar Seddiqi, a 36-year-old former Afghan military officer.

Seddiqi tells me how he woke for morning prayers on Thursday to find his refugee camp in northern Ukraine thrown into chaos as the Russian invasion began.

"It was all over the news. People started shouting until eventually the authorities in the camp opened the doors and told us to escape."

They walked for more than 75 km and made it to the northern city of Chernihiv, which is now a conflict zone. Seddiqi is now trying to reach Ukraine's western border to escape.

Image source, HAIDAR SEDDIQI

Fazila Haidari, 26, and her younger sister were flight attendants in Afghanistan. They ended up in Lviv, western Ukraine, after fleeing the Taliban.

They have been waiting in Ukraine to be resettled to a third country. They have been desperately seeking help, contacting anyone they know.

"We thought it'd be safe here but look at the situation. I've been calling UNHCR and other organisations, but no-one is answering our calls," Ms Haidari says.

“I was happy that I survived the Taliban, but I'm now wondering if leaving Kabul was the right decision because I'm now in the middle of another war."

They have now left Lviv to try and reach the Polish border.

There are an estimated 5,000 Afghans living in Ukraine, including 370 who fled in August when the Taliban re-took control of the country.

Image source, Getty Images

Night is falling in Kyiv after a third day of fighting across Ukraine.

The city has been under a curfew imposed by mayor Vitali Klitschko since 17:00 local time (15:00 GMT) - he tweeted that any civilian found on the street after that time "will be considered members of the enemy's sabotage and reconnaissance groups".

UK defence officials say that Russian troops have advanced within 30 km (19 miles) of the city.

But President Volodymyr Zelensky remains in the city and has been issuing defiant messages from his office and with troops.

Lyse Doucet
Chief International Correspondent reporting from Kyiv

Image source, AFP

The sounds of war seem to get ever closer in Kyiv, with a series of explosions about five minutes apart.

Russian forces are still on edge of city, trying to advance mainly from northern and easterly directions but they are still meeting resistance from Ukrainian forces.

This is a city where normal life has gone underground: people are in bomb shelters, in basements and the subway system been transformed into a 24-hour refuge.

It used to be a thriving European metropolis with lively cafes and music blaring loudly.

Now the only sounds blaring loudly are these attacks by Russian forces and the air-raid sirens which go off at regular intervals.

Tom Symonds
Home Affairs Correspondent

Image source, Getty Images

Demonstrations against Russia's invasion have been taking place across Europe - in London it is a protest which is personal as much as political.

The crowd is overwhelmingly made up of Ukrainians living here, or people from Eastern European countries horrified at what’s happening.

I have spoken to several people with close friends who have this morning signed up to fight for their country. Others have relatives trapped in basements, now out of contact, in the middle of a war zone.

They are shocked and furious, they say. On placards Russian President Vladimir Putin is compared to Nazi leader Adolf Hitler.

Two young Russian women say they are ashamed at what their country’s armed forces are doing and can see no way to stop it, but to come to the protest. They seem tormented by events.

Lucy Williamson
BBC News, Moldova

Seen from the Moldovan border, Ukraine is a nation of women.

Mothers and grandmothers, wheeling suitcases to safety, leading their children into the unknown.

Ana is travelling with her stepdaughter and granddaughter, the boot of their little yellow car stuffed with bags.

She breaks down and weeps freely as she tells me how she had to leave her husband behind in Kyiv. He had to stay to fight the Russian invasion.

After spending a day and a night queuing to get across this border, the relief of getting out of Ukraine opens the door to other feelings too.

One woman tells me she had abandoned her car after waiting more than 24 hours in the border queue, and walked into Moldova on foot, along with her pregnant daughter.

Almost all the 30,000 people who arrived here since Wednesday have stayed in Moldova. Most of those I spoke to hadn’t thought beyond getting out of Ukraine.

Emerging on this side of the border, confronted by makeshift stalls of coffee and sandwiches, and the offer of lifts from local volunteers, they were faced with a new challenge: what happens now?

Damian McGuiness
BBC News in Berlin

Germany has dropped its block on the delivery of German-made lethal weapons to Ukraine via third countries.

The move means the Netherlands will be able to send German 400 rocket-propelled grenade launchers to Ukraine.

It marks a major shift in German policy and could allow an increase of European military assistance to Ukraine as many weapons in Europe are at least partly German-manufactured, which means Berlin has a say on their use and export.

German Chancellor Olaf Scholz has repeatedly referred to this policy in recent weeks when refusing to deliver lethal weapons to Ukraine.

Image source, Getty Images

Let's just recap what the different players in the conflict have been saying today about Russian advances into Ukraine. Unsurprisingly, different narratives are coming from different capitals:

• According to state news agency RIA, Russia says its units have resumed their offensive on Ukraine from all directions after a pause on Friday. Moscow's defence ministry says it's ordered the attacks to be renewed after Ukraine refused to negotiate

• Ukraine says it remains in control of all the country's major cities, and that its forces have repelled Russian attacks while inflicting significant losses on the invading forces

• In Washington DC, US defence officials say Moscow is becoming increasingly frustrated by the "viable" Ukrainian resistance preventing Russian forces from gaining momentum. The UK also says the Russian advance has slowed

Sarah Rainsford
reporting from Dnipro, eastern Ukraine

In the centre of this major Ukrainian city, we just found crowds of women crouched on the grass making Molotov cocktails. These are homemade weapons, to defend their homes and their streets in Dnipro against the advance of Russian troops.

There were teachers, lawyers and housewives surrounded by glass bottles, rags and fuel. They said they were trying not to think too hard about what they were actually doing because, as one woman told me, it was "too terrifying".

But they do want to be ready for anything. This city has not come under attack, but it’s already feeling the cost of this war. The military hospital has 400 beds, and they’re full of wounded soldiers from all over eastern Ukraine.

At its gates, there’s a stream of local people bringing medicine, bandages and syringes and nothing is refused. Round the corner, men were lining up - to sign up, to fight.

The people of this city are mobilising. But they all say it’s not because they wanted any of this; they’ve been left with no choice.

Thousands of people packed on a crowded platform at a train station in the city of Lviv near the Polish border have tried to force their way onto a train bound for Poland.

The BBC's Fergal Keane describes the scenes, as a mother and her child were caught in the crush to escape Ukraine.

Ukraine's Foreign Minister Dmytro Kuleba has hit back at allegations that his government intends to detonate a dirty bomb on Russian territory.

Dirty bombs are devices that combine conventional explosives with radioactive material and are designed to kill thousands of people instantly.

Russian state TV has also been discussing the prospect in recent days and at Friday night's UN Security Council meeting Russia's ambassador Vasily Nebenzya told delegates: "We do not want Ukraine to develop a 'dirty bomb'."

In a tweet, Kuleba ridiculed the suggestion, saying: "Russian propaganda has gone off the rails."

Ukraine voluntarily gave up its nuclear weapons. It surrendered an arsenal of around 5,000 missiles and bombs in 1994 in exchange for security guarantees from Russia and the West.

Correction 20 April: This post has been amended to remove a description of Ukraine as the only country in history to voluntarily give up its nuclear weapons, as other countries have also done so.

A citywide curfew came into effect about 90 minutes ago and will last until Monday morning.

"All civilians that are on the streets during the period of the curfew will be considered members of sabotage groups of the enemy," the authorities in Kyiv said.

The mayor's office clarified an earlier announcement that said the curfew would last from 17:00-08:00 local time (15:00-06:00 GMT) every day.

The curfew now in place will not be lifted until 08:00 local time on Monday.

Orla Guerin
Reporting from Kyiv

The attack on the apartment block - hit by a missile earlier this morning - looks like a scene from a disaster movie.

A chunk of the building has been ripped away.

Yuri Shevchuk - who is 49 and has lived in the area for more than 20 years - was surveying the damage with an air of incomprehension. “I don’t know how to explain my feelings,” he said. "It’s the first time in my life to see such damage, in my city and in peacetime.”

And he pleaded for military help from the West: “I want to say to your government, we are in urgent need of anti-aircraft missiles, anti-tank missiles, and we need ammunition."

I asked if there was anything he would want to say to the Russian leader who has invaded his country.

“I want to say to President Putin, the only way is the way to hell," he said, adding: "And now I am going to the territorial defence unit.”

Mark Urban
Newsnight Defence and Diplomatic Editor

Across tweets, TikToks and Facebook posts there is a growing body of evidence of the scale of setbacks suffered by the Russian army.

Prisoners are interrogated, some dazed from the shock of capture and death of comrades, mumbling that they never knew they were being sent to Ukraine. One young Russian sits with his head in his hands, hiding his face as local people shout abuse about President Putin. Another, asked if he has a message for his family, says, “I love you.”

Along with the growing number of videos of prisoners there is grislier stuff of charred corpses in burnt out vehicles. The toll of dead and captured is unclear but UK defence ministry estimates of hundreds of fatalities are likely to be true, particularly if reports about two Russian transport aircraft being shot down in the early hours of Saturday are confirmed. There could be many tens of prisoners, given the videos circulating.

The revelation of these losses back home could have serious consequences for Putin. There is a long legacy of protest by soldiers’ mothers, for example during the Afghan and Chechen wars. Hence reports that Russia began restricting access to Twitter and Facebook, perhaps to slow the spread of images and testimony.

The UK's Ministry of Defence says that the speed of the Russian advance has temporarily slowed, likely as a result of "acute logistical difficulties and strong Ukrainian resistance".

"Russian forces are bypassing major Ukrainian population centres while leaving forces to encircle and isolate them," it tweeted.

The capture of Ukraine's capital, Kyiv, remains Russia's main objective, it adds.

We've been reporting since the morning on a strike that hit an apartment block in Kyiv.

It's now been confirmed by the authorities that two people were killed.

The State Emergency Service of Ukraine said six people were also seriously injured.

Image source, Reuters

A London-based Ukrainian woman has shared a story about an elderly relative who hid from Nazi troops as a child during World War Two - and eight decades later finds herself sheltering from fighting in another war.