From left, Olena Grygorii, Taras Firman, and Igor Ivaskiv, all native of Ternopil, western Ukraine, join Ukrainians and their supporters at a rally to protest Russian President Putin's "invasion of Ukraine and aggression in the region" Thursday, March 6, 2014, in front of the White House in Washington. President Barack Obama declared Thursday that a referendum in 10 days on the future of a Ukraine's Crimea peninsula would violate international law. (AP Photo/Manuel Balce Ceneta)