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A Ukrainian Sukhoi Su-27 fighter jet is seen during an event last month. A Ukrainian Air Force pilot was also killed during what the Ukrainian Defense Ministry called "a training and combat flight".

A USA serviceman was killed in Ukraine on Tuesday when a Ukrainian Air Force Su-27 fighter jet crashed during large-scale training exercises in the embattled former Soviet republic.

Fighter aircraft Su-27 crashed in Vinnytsia region, central Ukraine on Tuesday as the press service of the General Staff of the Armed Forces of Ukraine reported.

Ukrainian officials first reported the incident, noting that two pilots aboard the Su-27 had been killed in the crash during the joint multi-national exercise with USA and other North Atlantic Treaty Organisation air forces in the Khmelnytskyi region, according to The Associated Press.

"The incident is now under investigation, and we will continue to provide more information as soon as it becomes available", U.S. Air Forces in Europe and Africa said. "It is now under investigation and we will continue to provide more information as it becomes available", it added.

The U.S. Air Forces in Europe and Africa issued a statement saying it was aware of "reports claiming a U.S. casualty".

Incorporated into the training exercise were USA aircraft from the California Air National Guard, which included F-15C Eagles and a C-130J Super Hercules, Fox News noted.

USA servicemen stand in front of US F-15 fighter during an air force exercises on Starokostyantyniv military airbase in Ukraine, Oct. 12, 2018.

"Training will focus on air sovereignty, air interdiction, air-to-ground integration, air mobility operations, aeromedical evacuation, cyber defense, and personnel recovery", it added.