US President Obama: 'Russia on the wrong side of history'
3 March 2014 Last updated at 21:33 GMT
US President Barack Obama has accused Russia of violating international law over Ukraine and said Moscow was "on the wrong side of history".
American officials say they are planning to target Russian individuals and organisations with economic sanctions.
They have also once again urged Moscow to withdraw troops from Crimea, and have proposed sending international monitors to Ukraine.