Vladivostok [Russia], June 19 (ANI): A Russian court has imposed a prison sentence on United States staff sergeant Gordon Black, amidst ongoing negotiations between Moscow and Washington over a potential prisoner swap deal, according to Russian State media. On Wednesday, the Pervomaisky District Court of Vladivostok sentenced Black to three years and nine months in a penal colony. According to state-run TASS and Sputnik, Black was convicted of stealing USD 113 from his girlfriend and threatening her life. “The ball is in the court of the United States, we are waiting for them to respond to the…