The U.S. stepped up efforts to dissuade Russia from intervening in Ukraine’s increasingly unstable east, with President telling President Monday that a diplomatic solution to the crisis is still possible even as he warned against further escalation. Russia requested the call, the first between the presidents since March 28, after Mr. Putin annexed Crimea. The White House also confirmed that Central Intelligence Agency Director was in Kiev over the weekend, at the same time that pro-Russian . The moves come ahead of a high-stakes meeting this week between U.S. Secretary of State and officials from Russia, Ukraine and the European Union, as well as a visit to Kiev next week by Vice President . On Tuesday, U.S. Air Force Gen. Philip Breedlove, the military commander of the North Atlantic Treaty Organization, will issue recommendations on Western military support for Ukraine. The general has privately advocated increased strategic intelligence sharing, […]