Ukrainian military base in Crimea under Russian siege: Report

Hoping to pressure Russia to roll back its military presence, the US imposed financial sanctions and travel bans on Russians and other opponents of the new Kiev government on Thursday. The European Union suspended talks with Russia on a wide-ranging economic agreement and on granting Russian citizens visa-free travel to the 28-nation bloc, a long-standing Russian objective.

With a solitary Ukrainian athlete taking part in the opening ceremony, Putin opened the Winter Paralympics in Sochi on Friday against the backdrop of his country's military action in Crimea.

Ukraine delivered a pointed message by sending out only a single flag-bearer to represent the 23-strong team in the athletes' parade. The appearance of biathlete Mykhaylo Tkachenko drew a roar from the capacity crowd at the Fisht Olympic Stadium. Entering in a wheelchair with the Ukrainian flag, he wore a serious expression.

The Ukrainian team had announced only a few hours earlier that it would not boycott the games, but said it could pull out of the 10-day event if the Crimea situation escalates.

Crimea would be the first territory to join Russia since the breakup of the Soviet Union in 1991. South Ossetia and Abkhazia, which broke away from Georgia after a brief 2008 war with Russia, have been recognized as independent by Moscow, but there have been few serious moves to enable them to join Russia.