Over the weekend, the Kremlin beefed up its military presence in Crimea, a part of Ukraine since 1954, and pro-Russia forces keep pushing for a vote in favour of reunification with Moscow in a referendum the local parliament has scheduled for next Sunday.
US President Barack Obama has warned that the March 16 vote would violate international law. But in Moscow, Putin made it clear that he supports the referendum in phone calls with German Chancellor Angela Merkel and British Minister David Cameron.
Following an extraordinary meeting of the Ukrainian government, Prime Minister Arseniy Yatsenyuk announced that he will meet with Obama in Washington on Wednesday on a "resolution of the situation in Ukraine," the Interfax news agency reported. The White House confirmed the meeting.
"Our country and our people are facing the biggest challenges in the history of modern independent Ukraine," the prime minister said earlier in the day. "Will we be able to deal with these challenges? There should only be one answer to this question and that is: yes."