By Idrees Ali and Kanishka Singh WASHINGTON (Reuters) -The United States believes Russia used a short range ballistic missile to strike a railway station in east Ukraine on Friday, a senior U.S. defense official said. Ukraine said at least 50 people were killed and many more wounded in a strike on a station in the city of Kramatorsk that was packed with civilians hoping to flee the threat of a major Russian offensive. The U.S. defense official, speaking on condition of anonymity, said the Pentagon believes Russian forces used an SS-21 Scarab missile in the strike but that the motivation for th…
