Washington withdrew Friday from a nuclear missile treaty with Russia amid complaints that Moscow has been in violation of the pact for years – and the US now plans to soon test a new missile that would have been prohibited under the landmark pact.

Washington and Moscow ripped up the Intermediate-range Nuclear Forces treaty that President Ronald Reagan and Soviet leader Mikhail Gorbachev signed in 1987, sparking fears of a new arms race.

The treaty bans both sides from stationing short- and intermediate-range, land-based missiles in Europe.

“Russia is solely responsible for the treaty’s demise. … The United States will not remain party to a treaty that is deliberately violated by Russia,” Secretary of State Mike Pompeo said in Thailand, where he was attending an Asian security conference.

Washington said that for years Moscow has been developing and deploying nuclear weapons that violate the treaty and threaten the US and its allies, particularly in Europe.

The Kremlin pointed a finger at the United States.

“The denunciation of the INF treaty confirms that the US has embarked on destroying all international agreements that do not suit them for one reason or another,” the Russian Foreign Ministry said in a statement Friday.

“This leads to the actual dismantling of the existing arms control system,” it added.

Russian Deputy Foreign Minister Sergei Ryabkov called on the US and other NATO members to implement a moratorium on deploying intermediate-range nuclear missiles.

But NATO chief Jens Stoltenberg put the blame squarely on Russia, dismissing the call of a moratorium as not credible while saying the 29-country transatlantic alliance did not want a renewed battle for military supremacy.

“We will not mirror what Russia does,” Stoltenberg told reporters in Brussels. “We don’t want a new arms race. And we have no intention to deploy new land-based nuclear missiles in Europe.”

Now that the US military is free to develop weapons that were previously banned, it is planning a test flight of a new missile in coming weeks, according to a senior administration official who spoke on condition of anonymity.

The Pentagon’s budget includes $48 million for research on possible military responses to the Russian violations of the INF treaty, but the options do not include a nuclear missile.

The official downplayed the imminent test and said it was not meant as a provocation against Russia.

Because Washington adhered to the treaty for 32 years, the US is “years away” from effectively deploying weapons previously banned under the agreement, the official said.

Nonetheless, arms control advocates still worry that the US exit from the INF treaty will lead the two nations to also scrap the larger New START treaty, which expires in 2021.

“Pulling out of this treaty leaves New START as the only bilateral nuclear arms agreement between the U.S and Russia,” said physicist David Wright, co-director of the Global Security Program at the Union of Concerned Scientists.

If President Trump “pulls out of that treaty as well or allows it to lapse, it will be the first time since 1972 that the two countries will be operating without any mutual constraints on their nuclear forces.”

Pompeo announced in February that US participation in the INF pact was being suspended after the US asserted that Russia had not been complying with the terms for years — dating back to the Obama administration.

“The United States remains committed to effective arms control that advances US, allied, and partner security; is verifiable and enforceable; and includes partners that comply responsibly with their obligations,” Pompeo said Friday.

With Post wires