A defector has revealed that Russian sex bomb spy Anna Chapman was ordered by her Russian spy bosses to seduce US whistleblower and former National Security Agency contractor Edward Snowden.

According to former KGB major Boris Karpichkov, if Snowden accepted, he would have a right to Russian citizenship, which would have locked him in Russia, as he would have needed permission because of the citizenship, the Mirror reported.

He said that the pair had met just once, but Snowden had became concerned about what the consequences would have been.

Moscow sources told Karpichkov the Anna plan was hatched by Kremlin spymaster Vladimir Skorik. The 32-year-old spy even proposed marriage to Snowden on the orders of Russian intelligence high command on Twitter.