In a move that alarmed nuclear experts, anti-war activists, and policymakers around the world, the U.S. government notified international partners on Thursday that President Donald Trump is withdrawing the country from the Treaty on Open Skies over alleged Russian violations.\u0022Trump and enablers are systematically undoing the systems [put] in place at end of Cold War to prevent accidental conflict and escalation.\u0022—Jon Wolfsthal, Global Zero\u0022Once again, Donald Trump\u0026#039;s belligerent approach to foreign policy has put us all at risk,\u0022 declared\u0026nbsp; Win Without War advocacy director Erica Fein, warning that the withdrawal \u0022puts us further down the path of nuclear brinkmanship.\u0022The Open Skies Treaty (OST), which has over 30 other party states, was signed by then-U.S. Secretary of State James Baker under President George H.W. Bush in 1992 and entered into force a decade later. The agreement aims to build trust and reduce the risk of war through unarmed aerial surveillance over territories of all participants.\u0022Effective six months from tomorrow, the United States will no longer be a party to the treaty,\u0022 U.S. Secretary of State Mike Pompeo said in a statement Thursday, referencing the length of the withdrawal process. \u0022We may, however, reconsider our withdrawal should Russia return to full compliance with the treaty.\u0022The treaty is the third major arms agreement Trump has ditched since taking office in 2017—defying concerns about the global consequences in all three instances. He bailed on the Iran nuclear deal in May 2018 and began the process of exiting the Intermediate-range Nuclear Forces (INF) Treaty with Russia in February 2019.Good thread on misleading coverage of #OpenSkiesTreaty, which has helped prevent nuclear war for nearly three decades https://t.co/sidfHVwquJ— Emma Claire Foley (@emmaclairefoley) May 21, 2020After reports of the OST withdrawal Thursday morning, Trump later confirmed the decision to reporters outside the White House, saying that \u0022Russia didn\u0026#039;t adhere to the treaty, so until they adhere we will pull out, but there\u0026#039;s a very good chance we\u0026#039;ll make a new agreement or do something to put that agreement back together.\u0022The president added that \u0022we\u0026#039;ve had a very good relationship lately with Russia and you can see that with respect to oil,\u0022 and expressed his belief that exiting the multi-party treaty with push the Russian government to come to the table seeking a new arms deal. Nuclear experts, however, denounced Trump\u0026#039;s move as irresponsible.\u0022It is not surprising that President Trump would pull out of yet another important treaty, because this has become a reckless pattern for his administration.\u0022—John Tierney, Center for Arms Control and Non-ProliferationJohn Tierney, a former Democratic congressman who now serves as executive director of the Center for Arms Control and Non-Proliferation, said in a statement that \u0022it is not surprising that President Trump would pull out of yet another important treaty, because this has become a reckless pattern for his administration.\u0022\u0022The Open Skies Treaty has built trust, provided stability, and eased tensions between the United States, Russia, and 32 other countries across the Euro-Atlantic region,\u0022 Tierney added. \u0022The transparency it provides has helped prevent miscalculations and misunderstandings that could have otherwise led to conflict. In fact, the treaty has been providing vital information to the United States and its allies following Russia\u0026#039;s invasion of Ukraine.\u0022\u0022There are some compliance problems with the treaty, but experts and our allies believe they can and must be solved,\u0022 he said. \u0022President Trump should reverse this decision, recommit to working with our allies to fix issues with the Open Skies Treaty, and get rid of the staff who keep trying to wreck the global arms control and nonproliferation infrastructure in his name.\u0022“The problems we were having with #OpenSkies did not defeat the object \u0026amp; purpose of the treaty. It never appeared like the Trump Admin was really trying to fix these compliance problems. It seems like they only know how to break things,” says @atomicbell. https://t.co/WzlW8AzILY— Nukes of Hazard (@nukes_of_hazard) May 21, 2020Trump\u0026#039;s decision followed weeks of reporting about a potential U.S. exit from the treaty. In early April, House Armed Services Committee Chairman Adam Smith (D-Wash.), House Foreign Affairs Committee Chairman Eliot L. Engel (D-N.Y.), Senate Armed Services Committee Ranking Member Jack Reed (D-R.I.), and Senate Foreign Relations Committee Ranking Member Bob Menendez (D-N.J.), issued a joint statement saying they were \u0022deeply troubled\u0022 by the push toward withdrawal.\u0022The administration\u0026#039;s effort to make a major change to our national security policy in the midst of a global health crisis is not only shortsighted, but also unconscionable,\u0022 the Democratic congressional leaders said. \u0022We urge the administration to reverse course on this reckless policy decision rather than ramming it through while our country and the entire world grapples with an unprecedented crisis.\u0022Very reckless decision. In the middle of a pandemic, the last thing we need is more instability. This move puts our European allies in harm’s way, hands Putin another win, and tears down yet another arms control treaty that benefits U.S. national security. https://t.co/am4fr1Ml0G— Senator Chris Van Hollen (@ChrisVanHollen) May 21, 2020Arms Control Association (ACA) director for disarmament and threat reduction policy Kingston Reif noted Thursday that \u0022there is strong bipartisan support in Congress for maintaining U.S. participation in Open Skies.\u0022 He called the withdrawal \u0022a slap in the face to Congress as it violates notification requirements written into law last year.\u0022Specifically, an ACA statement explained, \u0022such action violates Sec. 1234 of the fiscal year 2020 National Defense Authorization Act, which requires the administration to notify Congress 120 days ahead of a U.S. notification of an intent to withdraw.\u0022Ditching the treaty is expected to impact the Trump administration\u0026#039;s relationships with European countries, explained Thomas Countryman, a former U.S. acting undersecretary of state for arms control and international security who now chairs ACA\u0026#039;s board.\u0022A unilateral U.S. exit from Open Skies would undermine our security and that of our European allies, all of whom strongly support the treaty,\u0022 he said. \u0022It has the effect—and perhaps this is the intention—of signaling a diminished U.S. commitment to its NATO allies.\u0022According to the Guardian:America\u0026#039;s European allies are keen to keep the treaty going. They have benefited from the over 1,500 overflights carried out under the OST, allowing them to observe Russian military movements, and see it as a remaining element of international cohesion and transparency.\u0022The writing has been on the wall for a long time,\u0022 a European diplomat said, adding it was \u0022still disappointing.\u0022Arms experts also expressed concern about what the withdrawal signals regarding future decisions on nuclear weapons and international cooperation.Jon Wolfsthal worked on nonproliferation and arms control at the National Security Council during the Obama administration and is now a member of the board of the Bulletin of the Atomic Scientists and a senior adviser to Global Zero, an international movement for the elimination of all nuclear weapons.In a series of tweets Thursday that put the withdrawal from the OST into a broader context, Wolfsthal highlighted a recent Global Zero report that warned the Trump administration is \u0022blundering toward nuclear chaos.\u0022We examined the larger trends in our report, released two weeks ago entitled Blundering Toward Nuclear Chaos that lays bare the mismanagement of US security under Trump and the increased dangers we face. https://t.co/wYhHIppXQr @globalzero— Jon “Please Stay Inside” Wolfsthal (@JBWolfsthal) May 21, 2020\u0022Today\u0026#039;s announcement is part of a troubling pattern,\u0022 ACA executive director Daryl G. Kimball said Thursday. \u0022The Open Skies Treaty is not the first, and may not be the last, nuclear or conflict risk reduction agreement this administration has withdrawn from without a viable strategy for replacement.\u0022\u0022Failure to take up Russia\u0026#039;s offer to extend by five years the 2010 New Strategic Arms Reduction Treaty, which the administration has threatened to do, would compound the damage,\u0022 Kimball warned, \u0022and further heighten the risk of unconstrained military and nuclear competition between the United States and Russia at a time when the world can ill afford it.\u0022\u0022The administration\u0026#039;s propensity for tearing up vital arms control agreements does not bode well for New START—the only remaining agreement limiting U.S. and Russian nuclear arsenals, which together account for more than 90% of the global nuclear stockpile.\u0022—Derek Johnson, Global ZeroGlobal Zero executive director Derek Johnson also raised concerns about that treaty Thursday, warning in a statement that \u0022the administration\u0026#039;s propensity for tearing up vital arms control agreements does not bode well for New START—the only remaining agreement limiting U.S. and Russian nuclear arsenals, which together account for more than 90% of the global nuclear stockpile.\u0022\u0022Rather than accept Russia\u0026#039;s offer to extend New START immediately and without preconditions, the Trump administration has proposed instead to negotiate a new trilateral agreement that includes China,\u0022 Johnson explained. \u0022Without extending New START, this proposal is either a fool\u0026#039;s errand or a deliberate farce. The U.S. nuclear arsenal alone is 13 times larger than China\u0026#039;s.\u0022\u0022The Chinese government has made it explicitly clear it is not interested in talking until further progress is made by the world\u0026#039;s biggest nuclear hoarders,\u0022 he added. \u0022Getting China\u0026#039;s nuclear forces under control is a worthy goal, and sustained efforts are required to do that—but if New START goes the way of the Intermediate-Range Nuclear Forces and Open Skies Treaties, the possibility of a bigger deal goes with it.\u0022This post has been update with comment from Derek Johnson, executive director of Global Zero.