Russia announced naval war games in the Black Sea and Ukraine put its troops on combat alert, as the United States called on both sides to show restraint amid dramatic new tensions over the Crimea peninsula.
Radio Free Europe/Radio Liberty: Russia holds war games, Ukraine troops go on alert, US calls for restraint
Russian soldiers unload trainload of their modified T-72 tanks after their arrival in Gvardeyskoe railway station near the Crimean capital Simferopol, on March 31, 2014.
