Russia says it invaded Ukraine to halt Kyiv's ambitions to join NATO, the U.S.-led defensive alliance, which it saw as a major security threat. It also accuses Kyiv of persecuting ethnic Russians and their culture in Ukraine.

Russian President Vladimir Putin on Thursday praised President Donald Trump for his efforts to broker an end to Moscow's invasion of Ukraine.

British Prime Minister Keir Starmer welcomed Ukrainian President Volodymyr Zelenskyy to London, a day before a critical U.S.-Russia summit in Alaska.