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               Resea rch Sevice





The Open Skies Treaty: Background and

Issues



Updated May 21, 2020
According to Secretary of State Michael Pompeo, the United States will give notice of its intent to
withdraw from the Treaty on Open Skies on May 22, 2020; the withdrawal will occur in six months, on
November 22, 2020.
The United States, Canada, and 22 European nations signed this treaty on March 24, 1992. It entered into
force on January 1, 2002, and now has 34 members. 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 had conducted 1,500 observation flights through early 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
copies of 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.

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
in May 1989. By this time, both the United States and Soviet Union collected intelligence with satellites
and remote sensors. As Europe emerged from the East-West divide of the Cold War, the United States
supported increased transparency to reduce the chances of military confrontation. The Open Skies Treaty
was one of three arms control arrangements-including the Vienna Document and the Conventional
Armed Forces in Europe Treaty (CFE)-which could serve, as then-Secretary of State Baker noted, as
the most direct path to greater predictability and reduced risk of inadvertent war.

Key Provisions
Open Skies participants make all their territory accessible to overflights by unarmed fixed-wing
observation aircraft. They can restrict flights for safety concerns, but cannot impede or prohibit flights
over areas, including military installations that would otherwise be off-limits. In most cases, the nation

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