The treaty is aimed at building confidence and familiarity among states-parties through their participation in the overflights. Over 1,500 Open Skies flights have been conducted since the deal entered into force in 2002, according to media reports.

The United States and Russia have blamed each other for noncompliance with the treaty. Washington and Moscow have each put a few limits on flights over their territories -- Hawaii and some other U.S. bases have been off-limits, as have Kaliningrad, among others, according to media reports.

It was the latest in a string of moves by the Trump administration to withdraw from a major international treaty. Washington abandoned the Intermediate-Range Nuclear Forces Treaty with Moscow last year.

The pullout of the Treaty on Open Skies further raised doubts over whether the Trump administration would extend the New Strategic Arms Reduction Treaty (New START), the last remaining nuclear arms control treaty in force between Washington and Moscow.

The New START, which expires next February, can be extended for at most five years with the consent of the two countries. Russia has expressed willingness to extend the treaty, while the Trump administration has yet to officially reply.

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