WASHINGTON — With the scrapping of a landmark arms control agreement Friday, the U.S. announced plans to test a new missile amid growing concerns about emerging threats and new weapons.

U.S. officials said they are no longer hamstrung and could now develop weapons systems previously banned under the Intermediate-range Nuclear Forces treaty with Russia, a Cold War-era agreement that both sides repeatedly accused the other of violating. The treaty was also criticized because it did not cover China or missile technology that did not exist a generation ago.

The end of the treaty comes amid rising doubts about whether the two countries will extend an agreement on long-range nuclear weapons scheduled to expire in 2021. President Donald Trump said he has been discussing a new agreement to reduce nuclear weapons with China and Russia.

“And I will tell you China was very, very excited about talking about it and so was Russia,” Trump told reporters. “So I think we’ll have a deal at some point.”

The Trump administration, which gave its six-month notice on Feb. 2 of its pending withdrawal from the INF, had repeatedly said Russia was violating its provisions,

“The United States will not remain party to a treaty that is deliberately violated by Russia,” Secretary of State Mike Pompeo said in announcing the formal withdrawal, calling a Russian missile system prohibited under the agreement a “direct threat to the United States and our allies.”

The end of the INF, which comes as world powers seek to contain the nuclear threat from Iran and North Korea, is another milestone in the deterioration of relations between the U.S and Russia.

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