The cause of the crash of the Sukhoi Su-27UB fighter of the Ukrainian Air Force in Vinnytsia region is now being determined and a flight recorder has been found, Ukrainian Defense Minister Stepan Poltorak said.

"The causes are still unknown. As to the plane, it underwent maintenance this year, if I'm not mistaken, in July, and we have just received it from the plant," the minister told reporters on Wednesday.

The investigation continues and the flight recorder from the plane has been found, he said.

A Su-27 plane belonging to the 831st Tactical Aviation Brigade from Myrhorod in Poltava region crashed in Vinnytsia region on October 16. Two pilots, Col. Ivan Petrenko, the head of aviation of the Air Force's Skhid (East) air command, and a serviceman of the Air Force of the U.S. National Guard, were killed.

Military prosecutors in Vinnytsia entered information into the Unified Register of Pre-Trial Investigations under the article "Violation of rules governing flights or preparations for them."

Flight documentation and plane documents were seized at airfields in Myrhorod and Starokostiantyniv in Khmelnytsky region. Witnesses of the plane's takeoff are being questioned.

The joint command of the Clear Sky 2018 exercises has decided to continue conducting flights.

At the same time, the command of the Ukrainian Air Force will not hold the events with media access scheduled for October 18-19 at the Clear Sky 2018 military exercises.