North Korea brought in nearly a dozen former KGB agents earlier this year to train leader Kim Jong Un's bodyguards in case an assassination attempt is carried out.
According to The Asahi Shinbum, about 10 former agents who specialized in counterterrorism traveled to Pyongyang in February and met with Kim's bodyguards.
There have been rumors for months that the United States may be preparing for a decapitation strike against North Korea as the reclusive nation continues to threaten the U.S. and other western nations.
The Asahi Shinbum reports that North Korean leaders are concerned about the American Gray Eagle attack drone, which will be deployed to South Korea next year, and a specialized CIA unit tasked with monitoring what's happening in North Korea.
It's not clear if the former KGB agents are still working with North Korea.
North Korea has conducted several missile tests this year, including one Friday that resulted in three projectiles falling harmlessly into the Sea of Japan.
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