On Wednesday 9th of August the Capital Police alerted the public that an "authorised low-altitude aircraft" would fly in restricted airspace between 11:00 am and 3:00 pm. The message stated that the aircraft "will be large and may fly directly over the U.S. Capitol."
The Capitol Police further added that the aircraft "will be monitored by U.S. Capital Police and other federal government agencies."
The Russian Air Force TU-154 aircraft conducted the flight under the Treaty on Open Skies between the U.S.A., Russian Federation, and 32 other countries. The Treaty's purpose is to promote peaceful transparency in the international community.