More than 15,000 Russian troops along Ukraine border: U.S. envoy

ASPEN Colorado (Reuters) - Russia has now amassed around 15,000 troops along the border with Ukraine, the U.S. ambassador to NATO said on Friday, offering a higher figure than one previously cited by the Pentagon. U.S. Ambassador to NATO Douglas Lute offered the estimate during a security forum in Colorado, saying there were "now up again over about 15,000 Russian troops amassed along the border with Ukraine." (Reporting by Phil Stewart; Editing by Susan Heavey)