"I am concerned that Russia has a good chance of recovering and taking advantage of these technologies," he wrote on Twitter.

Vindman stressed that the fall of the drone is "probably" due to pilot error.

On March 14, the European Command of the US Armed Forces announced that the Russian Su-27 hit the propeller of the American MQ-9 drone over the Black Sea, after which the drone fell into international waters.

At the same time, the Russian Ministry of Defense reported that Russian fighters did not use on-board weapons and did not come into contact with a US drone over the Black Sea.

The ministry said that as a result of sharp maneuvering, the US drone went into uncontrolled flight with a loss of altitude and collided with the water surface.