Russia extradites two U.S. military attaches
The reason for the expulsons hasn't been confirmed.
The U.S. doesn't officially link Moscow's move with the ousting of two Russian military attaches from Washington during the last six months.
The U.S. State Department hasn't revealed the names of the two diplomats involved, but added it isn't going to protest the expulsions.
Russia's Ministry of Foreign affairs has refused to comment.