A top Russian diplomat has lambasted the United States Congress for voting to sanction Russia, and warned of retaliation by Moscow.
Speaking on ABC's This Week on Sunday, Russian Deputy Foreign Minister Sergei Ryabkov referred to a bill passed by Congress on Thursday to sanction his country as "weird and unacceptable" and said it was "the last straw".
"If the US side decides to move further towards... deterioration, we will answer. We will respond in kind. We will... retaliate," he said.
Mr Ryabkov's comments came after Moscow ordered the United States on Friday to cut hundreds of diplomatic staff and said it would seize two US diplomatic properties as a response to the new sanctions that were approved nearly unanimously by both the House of Representatives and the Senate.
Mr Ryabkov confirmed that the seizing of the properties was in response to the bill, but declined to say what other measures Russia is willing to take if the United States continues to apply pressure.
"We have a very rich toolbox at our disposal," he said. "It would be ridiculous on my part to start speculating on what may or may not happen. We are not gamblers. We are people who consider things very seriously and very responsibly. But I can assure you that different options are on the table and consideration is being given to all sorts of things."
The United States-Russia relationship has become increasingly strained in the wake of US intelligence agencies' conclusion that the Kremlin interfered in the US election to discredit Hillary Clinton and help President Donald Trump win the election.
Russia has denied meddling in the US election.
Special counsel Robert Mueller, the former director of the FBI, is investigating Russian meddling in the 2016 presidential race and whether or not Mr Trump's campaign may have colluded with Russia - an allegation that Mr Trump and his associates have staunchly denied.