Why did false defector Yuri Nosenko say in January, 1964, that the KGB hadn't even interviewed Oswald during the two and one-half years he lived in the USSR?
(Fwiw, my hero Tennent H. Bagley didn't believe Oswald killed JFK at the direction of the KGB, but did think that, based on Nosenko's denials, one of the reasons KGB sent Nosenko to the U.S. was to prevent CIA/FBI from discovering some relationship Oswald had had with KGB before he defected to the USSR.)
Another possibility is that Nosenko told J. Edgar "Egg On Face" Hoover exactly what he wanted to hear about Oswald so that Hoover would automatically believe what he said about other subject matters, e.g., "Neither the CIA nor the FBI have any KGB moles."
(LOL)
-- Mudd Wrassler Tommy 
one of the reasons KGB sent Nosenko to the U.S. was to prevent CIA/FBI from discovering some relationship Oswald had had with KGB before he defected to the USSR.)I don't know how Nosenko defecting to the US could have kept the FBI or anybody from learning that Lee Oswald had been recruited by the KGB while he was serving on a top secret U-2 base in Japan. How does that work?
There's no doubt in my mind that Lee was recruited by the KGB while he was serving as a Marine in Japan....and there's also no doubt in mind that he had the blessing of ONI and the State Department, who helped him learn to understand and speak Russian. ( he wouldn't have been much use to the US if he couldn't Speak and understand Russian. )
The animosity between Hoover and other intelligence agencies kept him in the dark about Lee Oswald...He thought that Lee was a turn coat traitor and a commie....