This is just one more nail in that proverbial coffin:
Update: RIA Novosti reports an unnamed foreign ministry official protested the decision by EU, NATO nations to expel envoys, and confirmed that Russia will respond to each country expelling diplomats, warning that the "expulsions won't go unanswered."
“Unfriendly” action won’t be left unanswered.
U.K.’s allies are “blindly following” principle of Euro-Atlantic unity at the expense of common sense.
Additionally, Russia's ambassador to Washington, Anatoly Antonov, said that, with regard to the US response, "US only understand force."
"I mentioned in my statement in the State Department that I consider these actions counterproductive," Antonov said.
"I said that the United States took a very bad step by cutting what very little still remains in terms of Russian-American relations."