Ukrainian president Volodymyr Zelensky says his country has brought a complaint against Russia at the International Court of Justice and is requesting its panel of judges to order a halt to Moscow's invasion.

The ICJ, which is based in The Hague, is the UN's top court and decides whether or not a state has breached international law.

The court cannot bring criminal charges against individual heads of state.

As Russian troops enter the Ukrainian city of Kharkiv, images of clashes have been circulating on social media.

One video, verified by the BBC, shows a group of Ukrainian soldiers taking cover behind a wall, while one launches shoulder-fired missiles.

Since 2019 Russian soldiers have been banned from using smartphones while on duty, after their social media use raised issues of national security.

But as fighting continues, images shared by Ukrainian forces give us a picture of what’s happening on the ground.

Image source, Dan Baker

A British man living in Kyiv has been sheltering with his Ukrainian wife and 12-year-old daughter in the basement of the school where he teaches English.

Dan Baker's family decided to leave their 26th floor flat to find safety closer to Kyiv's centre.

"We’ve heard some huge explosions but not from this position now. When we were staying in our apartment we heard some huge explosions," he told the BBC.

"We’re now kind of in downtown, which might seem a stupid move, as the government building is within a mile of us. But we’ve not heard any fighting down here."

Baker says that on Wednesday his wife Victoria and daughter had their UK visas approved, and that for the moment the family feels safe.

"As it stands, we’ve got food, we’ve got water, we’ve got heat, electricity, wi-fi. We just need to be strong and see it out."

Baker is recording his experiences in video diaries posted to YouTube, external.

As Russian troops enter Kharkiv, Ukraine's second city, attacks are also continuing around Ukraine’s capital Kyiv.

Images shared online showed flames and plumes of smoke after Russian missile strikes hit near the city overnight.

One strike set an oil terminal ablaze in the town of Vasylkiv, south-west of the capital.

"The enemy wants to destroy everything," said the town’s mayor, Natalia Balasinovich.

Authorities in Kyiv have ordered citizens to stay indoors until Monday morning as Russian forces close in on the city.

All those venturing out "will be considered members of sabotage groups of the enemy", they warned.

Thousands of people have been sleeping in bomb shelters and metro stations, while others have taken guns distributed by authorities to help defend the city.

• Track the Russian invasion with our maps page

Image source, EPA

German Chancellor Olaf Scholz has announced sharp hikes in the country's defence spending.

Speaking at an emergency session of the German parliament he said €100 billion ($113 bn) will be added to Berlin's military budget this year.

It means Germany will now spend more than 2% of its annual GDP on defence, a longstanding NATO target the country has previously failed to meet - despite pressure from the US, and in particular former President Donald Trump.

It's the latest in a string of policy reversals announced by Germany in the last few days, including its decision yesterday to start sending weapons directly to Ukraine.

German Chancellor Olaf Scholz says the world has "entered a new era" following Russia's invasion of Ukraine, and that "there could be no other answer to Putin's aggression".

Image source, Reuters

The number of people fleeing Ukraine has now reached 368,000, according to the UNHCR.

As we reported earlier (see 09:06 GMT post), more than 150,000 people have entered Poland since the start of the conflict - while more than 43,000 Ukrainians fled to Romania in the three days after Russia invaded.

Image source, Getty Images

Ukrainian government ombudsman Lyudmyla Denysova says more than 210 Ukrainian civilians have been killed and more than 1,100 wounded in Russia's invasion.

"With unseen cruelty, the enemy is destroying residential buildings, hospitals, kindergartens and schools, taking away the right to live from the sons and daughters of Ukrainian land, including children," she said in a social media post.

Denysova gave examples of some of the civilian deaths, including a child killed in the shelling of a hospital in Kyiv, and a woman killed after a missile hit a residential building in Kharkiv.

She called for Russia to be “punished severely for these crimes”.

“Ukraine is noting down all these facts and will pass them on to the military tribunal in The Hague," she said.

Image source, Reuters

UN agencies and humanitarian partners are suspending operations in Ukraine "due to the deteriorating security situation".

The UN and its partners will maintain their presence across the country and resume work "once the situation permits", the UN Office for the Coordination of Humanitarian Affairs said.

Chelsea FC has described the situation in Ukraine as "horrific and devastating".

In a short statement the club said, external: "Chelsea FC’s thoughts are with everyone in Ukraine. Everyone at the club is praying for peace."

Earlier this week Chelsea's Russian owner Roman Abramovich announced he was "giving trustees of Chelsea's charitable foundation the stewardship and care" of the club.

Abramovich is one of Russia's richest people and is believed to be close to Russian President Vladimir Putin.

British politicians have called for him to be sanctioned - although he has previously travelled to the UK visa-free on an Israeli passport.

Chris Mason
Political Correspondent

Earlier, we heard Ukraine's President Zelensky urge fighters from overseas to join a newly-formed "foreign legion" (see 07:15 GMT and 07:59 posts)

And this morning, UK Foreign Secretary Liz Truss said if British people chose individually to head to Ukraine to join the fight, she would support them "absolutely if that is what they want to do".

Previously the UK has prosecuted people who travelled to the Middle East to fight for or against IS.

Ukraine's deputy defence minister has released an estimate of the losses she says the country's forces have inflicted on Russia so far.

Kyiv's Hanna Malyar said in a Facebook post, external that the numbers for the first three days of the conflict were preliminary and liable to change.

The BBC is unable to verify these claims - and Russia has not released casualty numbers.

Ukraine estimates Russian military losses so far to include:

• 4,300 deaths
• 27 planes
• 26 helicopters
• 146 tanks
• 706 armoured fighting vehicles
• 49 cannons
• 1 Buk air defence system
• 4 Grad multiple rocket launch systems
• 30 vehicles
• 60 tankers
• 2 drones
• 2 boats

Analysis: First real street fighting as Russia changes tacticspublished at 10:19 Greenwich Mean Time 27 February 2022

10:19 GMT 27 February 2022

Paul Adams
BBC diplomatic correspondent, Kyiv

Image source, AFP via Getty Images

The big concern for Ukraine’s government this morning is that Russian troops are now inside the country’s second-largest city, Kharkiv.

Sitting so close to the border with Russia, it was always likely to be one of the first major cities to be in jeopardy. This appears to be the first real street fighting so far.

Some of the images emerging from the city show Ukrainian troops firing rocket propelled grenades on street corners and Russian troops, on foot, moving behind armoured vehicles.

Urban warfare is messy and unpredictable. This will be a test for defenders and attackers alike.

Russia’s strategy so far seems to have been to bypass large cities, so this is a change of tactic - pointing to a desire not just to aim for the capital and replace the government, but to take over and hold major population centres.

Or, at least, to neutralise cities from which effective resistance can be organised against Russia’s gradually extending supply lines.

Image source, Ukrainian Armed Forces/Getty

This image taken from a video released by the Ukrainian military appears to show a Russian armoured vehicle burning in the city of Kharkiv.

Ukraine’s military says it destroyed the vehicle amid fighting in the city.

As we have been reporting, Russian troops have entered Kharkiv - Ukraine’s second-largest city - in recent hours.

The BBC has verified video footage showing Russian trucks driving into Kharkiv, as warnings came from local officials for civilians to stay in shelters and off the streets.

Image source, Getty Images

Russia's central bank is appealing for calm amid fears that new financial sanctions could spark a run on its banks - that is, too many people trying to withdraw money.

In a statement, it said: "The Bank of Russia has the necessary resources and tools to maintain financial stability and ensure the operational continuity of the financial sector."

On Saturday, Europe, the US, the UK and Canada announced that the assets of Russia's central bank will be frozen. It has reserves of around $630bn (£470bn).

The sanctions against the Bank of Russia would stop it from selling assets overseas to support its own banks and companies.

Europe, the US and its allies have also announced that a number of Russian banks will be removed from Swift, the international payment system which is pivotal for the smooth transaction of money worldwide.

Analysts predict that on Monday, when most markets reopen, the value of the rouble will drop - and Russians may rush to remove their money from banks.

"These new sanctions are likely to cause serious damage to the Russian economy and its banking system", said Clay Lowery, executive vice president at the Institute of International Finance.

"This will most likely exacerbate ongoing bank runs...causing a sharp sell-off, and a drain on reserves."

Image source, EPA

Greece has said it will send Ukraine "defence equipment" and humanitarian aid.

Two military transport planes will depart for neighbouring Poland on Sunday, according to Greece's prime minister's office.

But details of the equipment they would be carrying have not been revealed.

German chancellor Olaf Scholz previously announced his government would send 1,000 anti-tank weapons and 500 Stinger missiles to Ukraine.

Britain is also among more than 25 countries to pledge to continue to supply arms to Ukraine.

Ukrainian President Volodymyr Zelensky has welcomed the establishment of "a powerful coalition in support of Ukraine".

"This is already real. We are receiving weapons, medicine, food, diesel, and money," he added.

Chris Mason
Political Correspondent

UK Foreign Secretary Liz Truss has told the BBC "we are urgently looking at what more we can do" to help Ukrainian refugees.

"It is a desperate situation," she says. "We are working with the United Nations and we are working with the Red Cross."

But the foreign secretary did not offer any further detail.

Labour and the Scottish National Party have broken what was something of a political consensus in the UK on the invasion - demanding the British government does much more to help Ukrainian refugees come to the UK.

Although the UK has waived visa fees, and relaxed criteria, most Ukrainians still need a visa if arriving in the UK from Ukraine.

In case you're just joining us, let's take a minute to recap the latest lines coming out of Ukraine and elsewhere in Europe this morning:

• Russian troops have entered Kharkiv, the country's second-largest city, where they are fighting Ukrainian soldiers on the streets. Local authorities in the north-eastern city say Russian light vehicles have breached its centre and are urging civilians to remain in places of shelter
• President Volodmyr Zelensky has rejected Moscow's offer to meet for talks in Belarus. Kyiv says it is ready to negotiate with Russia elsewhere, but not in Belarus as the country is being used by Russia to launch its invasion into Ukraine

• Also this morning, Zelensky announced that Ukraine is setting up an "international" legion of volunteers for foreigners wishing to join the Ukrainian army in its fight against Russian forces

• The UK says that despite advances from multiple directions on Ukraine, it believes Russian forces are encountering "stiff resistance" from the country's army. According to intelligence assessments from London fighting continued last night in Kyiv, but at a lower intensity than the previous night

• Ukrainian civilians have also been attempting to block the advance of Russian forces peacefully. One video, external, believed to be recorded in the Chernihiv region, shows local residents halting a convoy of Russian tanks by walking at them en masse

• Finland and Ireland are closing their air space to all Russian flights. The UK and a majority of EU countries have done the same - and the EU says a formal decision by the bloc is expected on this shortly.

Image source, Anadolu Agency via Getty Images

As we reported at 09:28 GMT, Vladimir Putin has given a TV address in which he thanked special forces soldiers for “heroically fulfilling their military duty” in Ukraine.

Putin said the soldiers had been tasked with providing assistance to the “people's republics of Donbas” - referring to two rebel-held areas in eastern Ukraine that Russia recognised as independent states ahead of its invasion.

"I want to thank the command, the personnel of the special operations forces, veterans of the special forces units for their loyalty to the oath, for their impeccable service in the name of the people of Russia and our great motherland,” he said.

He ended the message saying: “I wish good luck, success and all the best to you and your loved ones.”

The address was given to mark Russia's special forces day, which has been held on 27 February since 2015.

As we reported earlier (see 08:41 GMT post), Finland and Ireland have become the latest countries to announce they are stopping Russian flights passing through their airspace.

Here's a map showing how westbound routes out of Russia have become increasingly blocked.

Image source, Getty Images

The International Judo Federation has suspended Vladimir Putin as honorary president and ambassador. The Russian president is a judo black belt.

The decision is one of a number of sport "sanctions" announced in recent days.

Russia's Formula 1 Grand Prix, due to take place in Sochi in September, has been cancelled.

And earlier in the week it was announced that the 2022 Champions League final would be played in Paris rather than St Petersburg.