(WASHINGTON) — In an escalating tit-for-tat, the United States forced Russia on Thursday to shutter its consulate in San Francisco and scale back its diplomatic presence in Washington and New York, as relations between the two former Cold War foes continued to unravel.

The Trump administration said the move constituted its response to the Kremlin’s “unwarranted and detrimental” decision to force the U.S. to cut its diplomatic staff in Russia. The U.S. gave Russia a mere 48 hours to close its San Francisco consulate, along with smaller Russian posts in Washington and New York.

“The United States is prepared to take further action as necessary and as warranted,” said State Department spokeswoman Heather Nauert. Still, she said the U.S. hoped both countries could now move toward “improved relations” and “increased cooperation.”

Russia said it regretted the order and pointed the finger at the U.S. for starting the “escalation of tensions” between the nuclear-armed powers. It wasn’t immediately clear whether the Kremlin would return the volley by retaliating for the U.S. retaliation. The Russian Foreign Ministry said Moscow was studying the decision to determine its response.

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