CNN  —  Three Americans who had been detained in China for years have been released in a prisoner swap between Washington and Beijing. “We are pleased to announce the release of Mark Swidan, Kai Li and John Leung from detention in the People’s Republic of China,” a US National Security Council spokesperson told CNN on Wednesday. “Soon they will return and be reunited with their families for the first time in many years.” The Americans were released in exchange for unidentified Chinese nationals