(15:49 UPDATE) Russia said it had expelled two U.S. Embassy staff members in June after a similar 'unfriendly' move by Washington, according to Reuters.

(14:38) The United States last month expelled two Russian diplomats as a response to a Russian police guard tackling a U.S. diplomat outside the American Embassy in Moscow, the State Department said Friday.

The diplomats were declared persona non grata on June 17, spokesman John Kirby said. That was less than two weeks after the incident that sparked the diplomatic row.

The June 6 scuffle between the police officer and the diplomat was captured on security footage and broadcast on Russian television last week. It shows a man emerging from a taxi and walking briskly up the embassy steps. He is just outside the door when a guard jumps out of a gatehouse and wrestles him to the ground. Even with the patrolman on top of him, the diplomat pushes with his feet and manages while on his back to get inside the door to the embassy, which is U.S. territory and inviolate.

Maria Zakharova, the Russian foreign ministry spokeswoman, called it an unprovoked attack of “an American spy on a Russian policeman.” She said the police officer on duty merely wanted to check his documents but was himself assaulted when the man struck him in the face with his elbow.

Under the Vienna convention, host governments provide security outside missions while the nations themselves are responsible inside the mission walls. In many compounds in the world, local police routinely ask for identification from anyone approaching. Inside the U.S. embassy grounds, Marines provide security.

Read more at The Washington Post.