President Donald Trump says his intention to scrap a landmark arms control agreement Russia follows years of violations by Moscow in developing prohibited weapons, and “we’re not going to be the only one to adhere to it.” The Kremlin said the pullout “would be a very dangerous step.”

Britain said it stood “absolutely resolute” with the US, while Germany called Trump’s move “regrettable.”

Heiko Maas said in a statement Sunday that the three-decades-old Intermediate-Range Nuclear Forces Treaty is “an important pillar of our European security architecture” and Trump’s announcement “raises difficult questions for us and Europe.”

The 1987 pact prohibits the United States and Russia from possessing, producing or test-flying a ground-launched cruise missile with a range of 300 miles to 3,400 miles.

Maas says Germany has repeatedly urged Moscow to “clear up the serious allegations of breaching the INF treaty, which Russia has so far not done.”

He says Germany is urging Washington to “consider the possible consequences” of its decision, including for a US-Russian nuclear disarmament treaty beyond 2021.

The 1987 Intermediate-range Nuclear Forces Treaty helps protect the security of the U.S. and its allies in Europe and the Far East. It bars the United States and Russia from possessing, producing or test-flying a ground-launched cruise missile with a range of 300 miles to 3,400 miles.

“Russia has violated the agreement. They have been violating it for many years,” Trump on Saturday said after a rally in Elko, Nevada.