"On December 15, 2018, a Su-27 aircraft crashed during the scheduled flight in the Zhytomyr region. The pilot was killed," the General Staff wrote on Facebook.
The reasons behind the incident are being investigated.
Ukraine's military prosecutor's office said later in the day that a criminal case was launched into the crash.
This is the second crash of this model aircraft in Ukraine over the past two months. On October 16, the Su-27 fighter crashed during the international exercise "Clear Sky — 2018" in the Vinnitsa region.
READ MORE: Ukrainian Air Force Confirms Death of US Serviceman in Su-27 Crash
5 November 2018, 16:35 GMT
As a result of the crash, both crew members died — Colonel Ivan Petrenko, Chief of Aviation of the Vostok Air Command, Air Force of the Armed Forces of Ukraine, and Lieutenant Colonel Lt. Col. Seth 'Jethro' Nehring, a member of the US National Guard Air Force.