With thousands of Russian troops already on the ground in Ukraine, President Obama says Putin's country is "on the wrong side of history."
And today, he warned there will be consequences for breaking international law, saying that the U.S. is "examining a whole series of steps" to respond economically and diplomatically to Russia's actions.
But what exactly are those steps? Here to discuss are General Wesley Clark, former NATO Supreme Allied Commander, and Michael McFaul, the former U.S. Ambassador to Russia.