U.S. taps ex-envoy to NATO to resolve Ukraine crisis

U.S. Secretary of State Rex Tillerson said on Friday he had chosen an envoy to lead U.S. diplomacy on the Ukraine crisis, adding that he had moved to fill the position at the urging of Russia's leader.Former U.S. Ambassador to NATO Kurt Volker, a longtime diplomat, will be responsible for advancing U.S. interests as set out in the 2015 Minsk agreement to curb the conflict in Ukraine's Donbass region.Russia annexed Ukraine's Crimea region in 2014, and Kiev accuses it of backing pro-Russian separa