Concerns are mounting after President Donald Trump confirmed on Saturday that he will withdraw from a Cold War-era nuclear arms control treaty with Russia following reports that National Security Adviser John Bolton had been pushing the plan behind closed doors despite warnings from experts that ditching the agreement “would be stupid and reckless.”

The Guardian had reported Friday that Bolton and an ally in the White House have been working to convince members of the administration to support the United States withdrawing from the 1987 Intermediate-range Nuclear Forces treaty (INF) on the grounds that Russia is violating it. Nuclear arms control experts and others rapidly responded with alarm. Many agreed that Russia’s alleged violation “merits a strong response” but noted a withdrawal could alienate European allies and raise the chances of armed conflict.

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The president’s comments on Saturday spurred more alarm, with Daryl Kimball of the Arms Control Association calling the looming withdrawal “an epic mistake.”

Jeffrey Lewis, the director of the East Asia nonproliferation program at the Middlebury Institute of International Studies at Monterey agreed. “This is a colossal mistake,” he told the Guardian. “I doubt very much that the U.S. will deploy much that would have been prohibited by the treaty. Russia, though, will go gangbusters.”

“By declaring he will leave the INF Treaty, President Trump has shown himself to be a demolition man who has no ability to build real security,” responded Beatrice Fihn, executive director of the International Campaign to Abolish Nuclear Weapons. “Instead, by blowing up nuclear treaties he is taking the U.S. down a trillion dollar road to a new nuclear arms race.” 

Journalist Glenn Greenwald tied the update to broader narratives about the Trump administration’s relationship with Russia, and in particular President Vladimir Putin: