Warning: Graphic content
Here are the latest developments in the war in Ukraine:
Ukraine a 'crime scene'
"Ukraine is a crime scene," the International Criminal Court's chief prosecutor says on a visit to the town of Bucha west of Kyiv, one of several towns where Russia is accused of massacring civilians.
Prosecutor Karim Khan says there are "reasonable grounds to believe that crimes within the jurisdiction of the court are being committed". The ICC investigates allegations of war crimes, crimes against humanity, genocide and aggression.
Russia committing 'genocide': Biden
US President Joe Biden accuses Russian forces for the first time of committing genocide in Ukraine.
"It's become clearer and clearer that (President Vladimir) Putin is just trying to wipe out the idea of even being able to be a Ukrainian," he tells reporters.
Biden assures Zelensky of support
President Joe Biden has called Ukrainian counterpart Volodomyr Zelensky to assure him of "ongoing US support" for Kyiv, the White House said.
Zelensky has tweeted they discussed an "additional package of defensive and possible macro-financial aid" worth hundreds of millions of dollars.
Russia threatens Kyiv
The Russian military has threatened to strike Ukraine's command centres in Kyiv as "we are seeing Ukrainian troops' attempts to carry out sabotage and strike Russian territory," Moscow's defence ministry said.
"If such cases continue, the Russian armed forces will strike decision-making centres, including in Kyiv," the ministry stated.
Le Pen for NATO
Moscow rapprochement -French far-right leader Marine Le Pen says she will back closer ties between NATO and Russia and pull Paris out of the alliance's military command if elected president in an April 24 runoff with Emmanuel Macron.
Amid accusations she is too close to Vladimir Putin, Le Pen said a "strategic rapprochement" is needed and questions need to be asked about the role of the alliance after the end of the Warsaw Pact.
Mariupol troops surrender: Moscow
Russia says more than 1,000 Ukrainian soldiers have surrendered in the besieged southeastern city of Mariupol after a ferocious six-week battle for the strategic port.
Ukraine has yet to confirm the report.
Ceasefire seems impossible: UN
UN Secretary-General Antonio Guterres says a "global ceasefire doesn't seem possible," indicating the UN is still waiting for answers from Russia to concrete proposals for evacuating civilians and delivering aid.
"That was our appeal for humanitarian reasons but it doesn't seem possible," said Guterres.
Polish, Baltic leaders to Kyiv
The leaders of Poland, Estonia, Latvia and Lithuania travel to Kyiv together by train to show support for Ukrainian President Volodymyr Zelensky.
German President Frank-Walter Steinmeier says he had planned to join them but was told by Kyiv he was "not wanted", with a top aide to Zelensky saying Kyiv wants German Chancellor Olaf Scholz to visit instead.
Separatists sanctioned
Britain says it and the European Union plan to impose sanctions on 178 pro-Russian separatists in eastern Ukraine.
Separatist forces have been fronting the fight against Ukrainian marines in Mariupol.
US warns China
US Treasury Secretary Janet Yellen warns that China's stance towards Russia and its invasion of Ukraine could affect countries' willingness to collaborate and trade with Beijing.
1,500 Russian soldiers in morgues
An official in the central Ukrainian city of Dnipro says the remains of more than 1,500 Russian soldiers are being kept in its morgues.
Dnipro deputy mayor Mikhail Lysenko tells reporters he hopes "Russian mothers will be able to come and pick up their sons".
Finnish NATO decision 'within weeks'
Finland's Prime Minister Sanna Marin says the country, which has been non-aligned since the end of the Cold War, will decide whether to apply for NATO membership "within weeks".
Russia's invasion of Ukraine has also relaunched a debate over NATO membership in neighbouring Sweden.