Edward Snowden is hoping to be able to leave Moscow's airport by Wednesday, a lawyer for the National Security Agency leaker said.

Anatoly Kucherena, Snowden’s attorney, said the former government contractor who disclosed information on secret NSA surveillance programs, expects to receive travel papers in days allowing him to leave the airport where he has been hiding for the last month.

"He should get this certificate shortly," said Kucherena said, according to Reuters.

Snowden is seeking to avoid extradition to the U.S. where he faces espionage charges.

He has received asylum from a number of Latin American countries but needs the permission of Russia to travel since his American passport has been revoked. Snowden has applied for temporary asylum from the Kremlin.

Russian President Vladimir Putin has suggested that Snowden could stay in the country as long as he stopped "his work aimed at harming our American partners."

Obama administration officials are pressing their Russian counterparts and other nations to return Snowden to the U.S.

President Obama raised Snowden’s status with Putin during a private phone call earlier this month, the White House said.