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Among the reasons for leaving, the Trump administration specifically contended that Russia refused access to observation flights within 10-kilometers along the border of Russian-occupied Georgia and that Russia designated an Open Skies refueling airfield in Ukrainian Crimea, both of which the U.S. saw as efforts to advance their illegal claims of control over those regions.
The U.S. also said Russia illegally placed restrictions on flight distance over Kaliningrad, the westernmost federal enclave of Russia, sandwiched between Lithuania, Poland, and the Baltic Sea, despite a significant Russian military build-up there.
The U.S. said Russia wrongly denied a joint U.S.-Canada observation flight over a big Russian military exercise back in 2019."
https://www.cnsnews.com/article/inte...eaty-years-now
Findings of Russian non-compliance were recorded in the very first State Department
report on OST compliance, issued three years after the treaty’s entry into force in 2002, and have appeared in various forms over the years since, U.S. Assistant Secretary Chris Ford said via teleconference after the announcement.
“A series of reports from 2004 through 2008, information reports from 2014 through 2019, all these have detailed various illegal Russian restrictions on … overflights,” he said.
Concerns about Russian non-compliance over the years prompted congressional hearings,
resolutions, letters from lawmakers to the administration, and the insertion of amendments into defense spending bills.
When
questioned by lawmakers about Russian violations, Obama administration officials typically defended the treaty’s value, and said that when issues arose the U.S. worked with the Russians to resolve them.
The last compliance
report under Obama, in April 2016, said, “Russia continues not to meet its treaty obligations to allow effective observation of its entire territory, raising serious compliance concerns,” adding that U.S. efforts to discuss the problems “have not resolved any of the compliance concerns.”
Compliance reports under Trump have continued to outline repeated attempts to resolve compliance concerns with Russia, to no avail....