sentences:  Yuri Nosenko
  
  Yuri Ivanovich Nosenko (; October 30, 1927 – August 23, 2008) was a KGB officer who defected to the United States in 1964.Controversy arose in the CIA over whether he was a bona fide defector and he was held in detention for over three years before he was finally accepted as a legitimate defector by the CIA.