A Russian warship that was damaged by an explosion on Wednesday has sunk, Russia's defence ministry has said.
There are growing signs Russia could be on the brink of fully capturing Mariupol, the besieged southern port city which has suffered a devastating, six-week assault.
German President Frank-Walter Steinmeier said on Tuesday he was ready to travel to Kyiv with colleagues from Poland and the Baltic states, but was told his presence in Ukraine would be undesirable.
Ukraine's security service says it has arrested the country's most senior pro-Russian politician, Viktor Medvedchuk. The opposition party leader had been under house arrest suspected of treason but fled shortly after the Russian invasion.
Ukrainian President Volodymyr Zelensky has said that Russian forces have faced "irreparable losses" since their invasion began 48 days ago.
Boris Johnson and Rishi Sunak have pledged to stay in post despite being fined by police for breaking lockdown rules in Downing Street in June 2020.
Russia has warned Finland and Sweden against joining Nato, arguing the move would not bring stability to Europe.
Emmanuel Macron has won the first round of the French election and far-right rival Marine Le Pen will fight him for the presidency for a second time.
Ukrainian President Volodymyr Zelensky has welcomed the latest wave of sanctions imposed on Russia, while also describing them as insufficient.
Russia's unmanned Luna-25 spacecraft has crashed into the Moon after spinning out of control, officials say.
Donald Trump has confirmed that he will not take part in Republican presidential debates with his rivals in the race for the White House.