Snowden, a former National Security Agency contractor and a self-admitted leaker of state secrets, fled from Hong Kong to Moscow on Sunday after the U.S. moved to extradite him to face espionage charges. He was expected to seek political asylum in Ecuador.
He was booked on a flight from Moscow to Cuba on Monday, but apparently was not on the plane. It was unclear where he was.
In the past two years, Kerry says, the U.S. has transferred seven prisoners to Russia that Moscow wanted.
The U.S. has revoked Snowden's passport.
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