President Barack Obama on Monday froze the U.S. assets of seven Russians close to President Vladimir Putin. The European Union announced similar sanctions one day after voters in Crimea supported a Russian-backed referendum to secede from Ukraine. "The entire world has got to stand up to Putin. We've got to deal with sanctions," Sen. Bernie Sanders had said in a television interview last Friday night. He said freezing Russians' assets was one possible recourse. "There are a number of things that you could do. But this is what you don't do: You don't go to war. You don't sacrifice lives of young people in this country as we did in Iraq and Afghanistan."