A Ukrainian Su-27 air force fighter crashed during a training exercise on Tuesday, killing both the pilot and co-pilot, a statement from the general staff said.
One of the pilots killed was a U.S. citizen, the U.S. military said, adding that the circumstances of the crash were under investigation.
The two pilots, the other of whom was Ukrainian, were the only people on board.
The crash took place during Clear Sky 2018, multinational air drills involving military personnel from eight foreign countries also including Britain, the Netherlands, Poland and Estonia that started last week.
According to information released by the Ukraine military prosecutor's office military fighter jet SU-27UB, tail number 70, crashed near the village of Ulaniv, Vinnytsya region at around 17:00 local time (14:00 GMT).
The same Su-27 is believed to have been seen taking part in the training exercises on Friday.
Autor: gf / Źródło: TVN24 International, Reuters