President Donald Trump speaks to media before boarding Air Force One at Elko Regional Airport, Saturday, Oct. 20, 2018, in Elko, Nev., after a campaign rally. (AP Photo/Carolyn Kaster)

President Donald Trump speaks to media before boarding Air Force One at Elko Regional Airport, Saturday, Oct. 20, 2018, in Elko, Nev., after a campaign rally. (AP Photo/Carolyn Kaster)

ELKO, Nevada (AP) — President Donald Trump said Saturday he will exit a landmark arms control agreement the United States signed with the former Soviet Union, saying that Russia is violating the pact and it’s preventing the U.S. from developing new weapons.

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

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“Russia has violated the agreement. They have been violating it for many years,” Trump said after a rally in Elko, Nevada. “And we’re not going to let them violate a nuclear agreement and go out and do weapons and we’re not allowed to.”

The agreement has constrained the U.S. from developing new weapons, but America will begin developing them unless Russia and China agree not to possess or develop the weapons, Trump said. China is not currently party to the pact.

“We’ll have to develop those weapons, unless Russia comes to us and China comes to us and they all come to us and say let’s really get smart and let’s none of us develop those weapons, but if Russia’s doing it and if China’s doing it, and we’re adhering to the agreement, that’s unacceptable,” he said.

National Security Adviser John Bolton was headed Saturday to Russia, Azerbaijan, Armenia and Georgia. His first stop is Moscow, where he’ll meet with Russian leaders, including Foreign Minister Sergei Lavrov and Security Council Secretary Nikolai Patrushev. His visit comes at a time when Moscow-Washington relations also remain frosty over the Ukrainian crisis, the war in Syria and allegations of Russian meddling in the 2016 presidential race and upcoming U.S. midterm elections.

There was no immediate comment from the Kremlin or the Russian Foreign Ministry on Trump’s announcement.

Trump didn’t provide details about violations, but in 2017, White House national security officials said Russia had deployed a cruise missile in violation of the treaty. Earlier, the Obama administration accused the Russians of violating the pact by developing and testing a prohibited cruise missile. Russia has repeatedly denied that it has violated the treaty and has accused the United States of not being in compliance.

Defense Secretary James Mattis has previously suggested that a Trump administration proposal to add a sea-launched cruise missile to America’s nuclear arsenal could provide the U.S. with leverage to try to convince Russia to come back in line on the arms treaty.

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Russia’s Foreign Ministry said in February that the country would only consider using nuclear weapons in response to an attack involving nuclear or other weapons of mass destruction, or in response to a non-nuclear assault that endangered the survival of the Russian nation.

“We are slowly slipping back to the situation of cold war as it was at the end of the Soviet Union, with quite similar consequences, but now it could be worse because (Russian President Vladimir) Putin belongs to a generation that had no war under its belt,” said Dmitry Oreshkin, an independent Russian political analyst. “These people aren’t as much fearful of a war as people of Brezhnev’s epoch. They think if they threaten the West properly, it gets scared.”

Trump’s decision could be controversial with European allies and others who see value in the treaty, said Steven Pifer, a former U.S. ambassador to Ukraine and now a senior fellow at the Brookings Institution who focuses on nuclear arms control.

“Once the United States withdraws from the treaty, there is no reason for Russia to even pretend it is observing the limits,” he wrote in a post on the organization’s website. “Moscow will be free to deploy the 9M729 cruise missile, and an intermediate-range ballistic missile if it wants, without any restraint.”

U.S. officials have previously alleged that Russia violated the treaty by deliberately deploying a land-based cruise missile in order to pose a threat to NATO. Russia has claimed that U.S. missile defenses violate the pact.

In the past, the Obama administration worked to convince Moscow to respect the INF treaty but made little progress.

“If they get smart and if others get smart and they say let’s not develop these horrible nuclear weapons, I would be extremely happy with that, but as long as somebody’s violating the agreement, we’re not going to be the only ones to adhere to it,” Trump said.

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Balsamo reported from Washington. Associated Press writers Deb Riechmann in Washington and Tanya Titova and James Heintz in Moscow contributed to this report.