The Pentagon has released footage of a Russian fighter jet colliding with a U.S. surveillance drone over the Black Sea on Tuesday.

While making what the Pentagon said was a routine flight in international airspace, the uncrewed MQ-9 Reaper was intercepted by two Russian Su-27 fighter jets. The warplanes dumped jet fuel on the drone and flew in front of it before one of the jets struck the drone’s propeller.

U.S. operators were forced to ditch the uncrewed aircraft in the Black Sea. The U.S. said the Russian pilots were “reckless” and “unprofessional.” Russian officials denied responsibility for the crash, shifting blame to the drone’s pilots.

Despite the incident, the U.S. will continue conducting surveillance flights worldwide, Defense Secretary Lloyd Austin said Wednesday.

“Make no mistake, the United States will continue to fly and to operate wherever international law allows,” Austin said at the start of a virtual meeting of nations supporting Ukraine against Russia. “It is incumbent upon Russia to operate its military aircraft in a safe and professional manner.”

Austin singled out Moscow’s forces, calling the incident “a pattern of aggressive and risky, and unsafe actions by Russian pilots in international airspace.”

The collision set off a diplomatic row Tuesday as American officials scrambled to speak with their Russian counterparts and voice concerns to Moscow.

Following the crash, Anatoly Antonov, Moscow’s ambassador in Washington, met with officials at the State Department. In a statement, Antonov said he “categorically rejected all the insinuations” the U.S. has made regarding the Kremlin’s culpability, blaming the drone for “moving deliberately and provocatively towards the Russian territory.”

The collision marks the first time one of these aerial intercepts “resulted in a splashing of one of our drones,” National Security Council spokesperson John Kirby told reporters Tuesday. One Reaper drone costs about $14 million.

Nahal Toosi contributed to this report.