MOSCOW (Reuters) - Russia said on Saturday it was fully committed to a Cold War-era pact with the United States banning intermediate-range cruise missiles, a day after Washington accused Moscow of violating the treaty.

FILE PHOTO: Russian Deputy Foreign Minister Sergei Ryabkov looks on at the start of two days of closed-door nuclear talks at the United Nations offices in Geneva October 15, 2013. REUTERS/Fabrice Coffrini/Pool

The U.S. State Department said on Friday Washington was reviewing military options, including new intermediate-range cruise missile systems, in response to what it said was Russia’s ongoing violation of the 1987 Intermediate-Range Nuclear Forces Treaty.

The warning was the first response by President Donald Trump’s administration to U.S. charges first leveled in 2014 that Russia had deployed a ground-launched cruise missile that breaches the pact’s ban on testing and fielding missiles with ranges of 500-5,500 kms (310-3,417 miles).

Russian Deputy Foreign Minister Sergei Ryabkov said those allegations were “absolutely unfounded”.

“They are not supported by the technical characteristics of the launch installation which allegedly does not comply with the treaty, or by flight telemetry data. Nothing. And it is understandable why - because it simply does not exist,” he said in written comments published by the foreign ministry.

Echoing previous Russian statements, Ryabkov said Moscow was fully committed to the treaty, had always rigorously complied with it, and was prepared to continue doing so.

“However, if the other side stops following it, we will be forced, as President of the Russian Federation Vladimir Putin has already said, to respond in kind,” he added.

The U.S. allegation has further strained relations between Moscow and Washington, and the State Department on Friday hinted at possible economic sanctions over the issue.

Washington has already sanctioned Russian entities and individuals, including people close to Putin, for Moscow’s 2014 seizure of Crimea from Ukraine and its alleged interference in the 2016 U.S. presidential election. The Kremlin has repeatedly denied interfering in the election.

Ryabkov said the “attempts to frighten us with sanctions” were laughable.

“It’s time for American politicians and diplomats to understand that economic and military pressure on Russia will not work,” he said.

(This version of the story has been refiled to clarify in paragraph 2 that it is U.S. administration, not State Department, reviewing military options)