U.S. expels 12 Russian U.N. diplomats over security concernsThe United States has expelled 12 Russian diplomats at the United Nations over national security concerns, U.S. and Russian diplomats said on Monday. The U.S. mission to the United Nations described the Russian diplomats as "intelligence operatives" who had been "engaging in espionage activities that are adverse to our national security." "This action has been in development for several months," said U.S. mission spokesperson Olivia Dalton.