Just when you thought U.S.-Russia relations couldn't get worse, diplomatic deals on both Syria and nuclear security fell apart this week.
Moscow went first, announcing that it was pulling out of a landmark agreement on plutonium. Russia's President Vladimir Putin blamed "unfriendly actions" by the United States.
Hours later, Washington said it was breaking off talks on a ceasefire in Syria. "This is not a decision that was taken lightly," State Department spokesman John Kirby wrote in a statement. "Unfortunately, Russia failed to live up to its own commitments."