The Treaty on Open Skies, which entered force in 2002, permits signatories
to make short-notice, unarmed observation flights over each other's territory
to monitor military forces and promote transparency. The U.S. withdrew
from the accord in 2020 after years of Russian violations, likely ending the
agreement for good. Above, a Russian Tu-154M Open Skies aircraft after
landing at Joint Base Pearl Harbor-Hickam, Hawaii, on Aug. 14, 2019.
Last year, the Trump administration decided...