A Russian plane collided with an American unmanned plane in international airspace over the Black Sea, causing the latter to crash.
Two Su-27 planes had tried to intercept the American drone – named MQ-9 – by throwing fuel in front of it several times before the collision.
It was an attempt to damage the plane.
Around 7:03 a.m. CET (6:03 a.m. GMT) a Russian the aircraft struck the propeller of the MQ-9 drone, causing US forces to shoot down the unmanned aircraft.
A statement from the United States’ European Command described the Russian maneuvers as reckless, unprofessional and damaging to the environment.
The drone was performing a routine flight in accordance with international laws to strengthen Europe’s collective defense and security, he said.
It is the latest in a series of dangerous Russian flights, the statement said, which could lead to an “unintended escalation”.
WE Air Force General James Hecker described the incident as a “dangerous and unprofessional act by the Russians” which led to the complete loss of one MQ-9.
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White House spokesman John Kirby added that while there were other interceptions, this one is particularly noteworthy because it was “dangerous and unprofessional”.
He said it was “unique” in that it led to the drowning of an American plane.
The United States will continue to fly and operate over the Black Sea, according to Mr Kirby, who said he did not need to check with the Russians when he did, because it is over international waters.
There was no immediate reaction from Moscow, which has repeatedly expressed concern about US intelligence flights near the Crimean peninsula, which Russia illegally annexed from Ukraine in 2014.