Merkel, Poroshenko, Biden in Germany as Ukraine diplomatic flurry peaks

Russian President Vladimir Putin, center, French President Francois Hollande, right, and German Chancellor Angela Merkel pose for a photo during their meeting in the Kremlin in Moscow, Russia, Friday, Feb. 6, 2015. Talks among the leaders of Russia, France and Germany on a peace initiative for Ukraine ended early Saturday with an announcement that Russian President Vladimir Putin and his Ukrainian counterpart would discuss a proposal to end the fighting in a four-way telephone call this weekend.(AP Photo/Alexander Zemlianichenko) (The Associated Press)

German Chancellor Angela Merkel gestures during her speech at the 51. Munich Security Conference in Munich, Germany, Saturday, Feb. 7, 2015. The conference on security policy takes place from Feb. 6, 2015 until Feb. 8, 2015. German Chancellor Angela Merkel says it's still uncertain whether a flurry of democracy aimed at resolving the crisis in Ukraine will succeed. Merkel insisted Saturday after returning from talks in Moscow the previous night that "this crisis cannot be solved by military means." (AP Photo/Matthias Schrader) (The Associated Press)

German Chancellor Angela Merkel delivers her speech at the 51. Munich Security Conference in Munich, Germany, Saturday, Feb. 7, 2015. The conference on security policy takes place from Feb. 6, 2015 until Feb. 8, 2015. German Chancellor Angela Merkel says it's still uncertain whether a flurry of democracy aimed at resolving the crisis in Ukraine will succeed. Merkel insisted Saturday after returning from talks in Moscow the previous night that "this crisis cannot be solved by military means." (AP Photo/Matthias Schrader) (The Associated Press)