Unarmed Russian Air Force jet overflies the Pentagon, Capitol, CIA

(CNN) An unarmed Russian Air Force aircraft overflew the US Capitol, the Pentagon, Central Intelligence Agency and Joint Base Andrews at low altitude on Wednesday as part of a longstanding treaty that allows the militaries of the United States and Russia to observe the other from the air, according to two people familiar with the flight.

The flight was part of the Treaty on Open Skies, which allows military aircraft from the United States and Russia and other nations to fly aerial observation flights to observe military sites of the 34 signatory nations.

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