WASHINGTON (Reuters) - President Barack Obama said on Monday that Russia has violated international law in its military intervention in Ukraine and said the U.S. government has warned it will look at a series of economic and diplomatic sanctions that would isolate Moscow.
Russian President Vladimir Putin needs to allow international monitors to mediate a deal in Ukraine acceptable to all Ukrainian people, Obama told reporters before he met with Israeli Prime Minister Benjamin Netanyahu.
"Over time this will be a costly proposition for Russia. And now is the time for them to consider whether they can serve their interests in a way that resorts to diplomacy as opposed to force," Obama said.
(Reporting by Mark Felsenthal, Roberta Rampton, Matt Spetalnick; Editing by Bill Trott)