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The Open Skies Treaty: Background

and Issues



Updated April 7, 2021
The United States announced its withdrawal from the Treaty on Open Skies on May 22, 2020; this
withdrawal took effect on November 22, 2020. The United States no longer participates in flights or
shares data collected by others. Russia also announced its plans to withdraw, while beginning the
domestic procedures for withdrawal on January 15, 2021. It has indicated that it will soon send its official
notification to the other treaty parties.
The United States, Canada, and 22 European nations signed this treaty on March 24, 1992. It entered into
force on January 1, 2002, and had 34 members before the U.S. withdrawal. The parties permit unarmed
observation aircraft to fly over their entire territories to observe military forces and activities. The treaty is
designed to increase transparency, build confidence, and encourage cooperation among European nations.
The parties conducted 1,500 observation flights through October 2019. Some parties provide their own
aircraft, but they can also join overflights on aircraft provided by other nations. Both the observing nation
and observed nation have access to the data from each flight; other parties can purchase the data, so all
can share information collected during all flights. According to the State Department, the United States
conducted nearly three times as many flights over Russia as Russia did over the United States. Further,
the parties can invite flights over their territories in special circumstances, as Ukraine did in 2014, when
Open  Skies flights helped monitor activities along the Ukraine-Russian border.
Russian officials insisted that the remaining participants not share data collected on Open Skies flights
with the United States and indicated that they expected to continue to fly over U.S. bases and facilities
located on the territories of other treaty parties. After the other parties rejected these conditions, Russia
announced its plans to withdraw from the treaty.
The Biden Administration has not yet decided whether it will seek to rejoin the treaty, but recent reports
indicate the Administration has informed U.S. allies that it is concerned that rejoining the treaty could
send the wrong message to Russia and undermine our position on the broader arms control agenda if
Russia continues to violate Open Skies. In addition, the Air Force has removed the U.S. Open Skies
aircraft from service and has taken steps to retire them.

Background
President Eisenhower proposed an Open Skies agreement in 1955 to reduce the risk of war. Before
satellites existed, aerial overflights provided information for both intelligence and confidence-building
purposes. The Soviet Union rejected the proposal because it considered overflights equal to espionage and
believed the United States had more to gain than it did. President George H. W. Bush revived the proposal


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