On Monday, Russia blamed Ukraine for explosions at two air bases home to strategic bombers.
The attacks were carried out with "Soviet-era" drones, per Russia's Ministry of Defense.
If true, that is a "baffling" admission, military expert Samuel Bendett told Insider.
"Baffling," Samuel Bendett, a military expert with the Center for Naval Analysis, a Washington think tank, said in an interview.
Neither Ukraine nor Russia claimed it was theirs, but the incident showed the craft is still being used today.