Russia says expelled two U.S. diplomats in June in retaliation.
Russia said on Saturday it had expelled two U.S. Embassy staff members in June after a similar 'unfriendly' move by Washington.
One of the expelled diplomats was involved in an incident with a Russian policeman near the U.S. Embassy entrance in Moscow, the Foreign Ministry said in a statement, citing Deputy Foreign Minister Sergei Ryabkov.
Another diplomat was "also a CIA operative", Ryabkov said.
The United States expelled two Russian officials on June 17 in response to an attack by a Russian policeman on a U.S. diplomat in Moscow earlier in the month, the State Department said on Friday.