"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."

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President Trump has reportedly ordered the expulsion of 60 Russians from the United States on Monday, including 12 people identified as Russian intelligence officers who