They cited a years-long effort by Russia to violate the terms, such as by restricting USA overflights of Russian neighbour Georgia and its military enclave in Kaliningrad.
"I think we have a very good relationship with Russian Federation, but Russia didn't adhere to the treaty, and so until they adhere to the treaty, we will pull out", Mr.
"But there is a very good chance we will make a new agreement or do something to put that agreement back together", Trump added, without elaborating.
In a classified State Department memo obtained by Newsweek, called "Open Skies Treaty-Demarche to Allies and Partners on U.S. Withdrawal", Secretary of State Mike Pompeo sent talking points to all NATO posts and U.S. embassies in Bosnia and Herzegovina, Finland, Georgia, Sweden, and Ukraine that laid out the reasons for the withdrawal.
Some experts worry that a USA exit from the treaty, which will halt Russian overflights of the United States, could prompt Moscow's withdrawal, which would end overflights of Russia by the remaining members, weakening European security at a time that Russian-backed separatists are holding parts of Ukraine and Georgia.
If the US does exit, Open Skies would be the third major global military pact Trump has withdrawn the USA from, coming after the president spiked the Iran nuclear deal and the Intermediate Nuclear Forces treaty.
That treaty, signed by President Ronald Reagan and Soviet leader Mikhail Gorbachev, banned production, testing and deployment of land-based cruise and ballistic missiles with a range of 500 to 5,500 kilometers (310 to 3,410 miles).
"Russia didn't adhere to the treaty, so until they adhere, we will pull out", Trump told reporters on May 21. Critics of the treaty have argued that the USA gets better intelligence from satellite systems and that the funding to replace the aging OC-135 aircraft can be spent elsewhere. Russian Federation has offered to extend the treaty, but Trump is holding out in hopes of negotiating a three-way agreement with the US and China.
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In his letter, Trump also accused WHO of "missteps" and threatened to make the freeze on US funding for the organization permanent.
The New York Times reported that the Pentagon and American intelligence agencies feared the Russians were also using flights over the United States to map out critical American infrastructure to prepare for a potential cyber attack.
The Open Skies treaty, proposed by US President Dwight Eisenhower in 1955, was signed in 1992 and took effect in 2002.
The administration Thursday morning began informing the other 34 members in the agreement, which allows mutual reconnaissance flights over the member nations, including Russian Federation.
But he said Russian Federation "flagrantly and continuously violates its obligations under Open Skies and implements the treaty in ways that contribute to military threats against the United States, our allies and partners". And it may be in Russia's interest to remain in the treaty, exacerbating the unease of Washington's partners, while it continues its flights over their territory.
Alexandra Bell, a former State Department official and now the senior policy director at the nonpartisan nonprofit Center for Arms Control and Non-Proliferation, said withdrawal from Open Skies will rub allies the wrong way.
At its core, the Treaty was created to provide all signatories an increased level of transparency and mutual understanding and cooperation, regardless of their size.
U.S. President Donald Trump claimed that his country would abandon the Treaty on Open Skies; however, it still has an opportunity to get back to it. Washington abandoned the Intermediate-Range Nuclear Forces Treaty with Moscow previous year.