A Russian Su-27 fighter jet conducted what U.S. officials are characterizing as an unsafe, unprofessional intercept of a U.S. Navy surveillance aircraft over the Black Sea on Monday. According to a statement released by US Naval Forces Europe, the Russian fighter closed to within just feet of the American aircraft.

“A U.S. EP-3 Aries aircraft flying in international airspace over the Black Sea was intercepted by a Russian SU-27,” U.S. Naval Forces Europe spokesman, Capt. Pamela Kunze told reporters. “This interaction was determined to be unsafe due to the Su-27 closing to within five feet and crossing directly through the EP-3’s flight path, causing the EP-3 to fly through the SU-27’s jet wash.”

“Unsafe actions‎ increase the risk of miscalculation and midair collisions,” Kunze went on, adding, “The U.S. aircraft was operating in accordance with international law and did not provoke this Russian activity.”

The EP-3 Aries is an unarmed surveillance aircraft that was reportedly conducting routine operations over international waters at the time of the intercept. The Russian Su-27 pilot reportedly harassed the Aries crew for over two hours and 40 minutes, before the fighter’s aggressive maneuvers forced the four-prop airplane to divert from its mission ahead of schedule.