U.S. Secretary of State John Kerry on Monday called on Russia to “do the right thing” and prevent National Security Agency leaker Edward Snowden from fleeing Moscow and instead return him to the United States. "We hope that the Russians will do the right thing. We think it is very important in terms of our relationship,” Kerry told NBC News. Snowden booked a flight from Russia to Cuba, which he did not show up to Monday. White House spokesman Jay Carney said the U.S. assumes Snowden remains in Russia. Kerry pointed out that the U.S. has returned seven criminals to Russia in recent years and said that Snowden has betrayed his country. Snowden was expected to eventually journey to Ecuador, where officials have confirmed they are considering his request for asylum.