Pilot Savchenko is on plane bound for Kiev from Russia

Ukrainian military pilot Nadezhda Savchenko looks out from a defendants' cage as she attends a court hearing in Moscow March 4, 2015. REUTERS/Maxim Zmeyev/File Photo

KIEV (Reuters) - Detained Ukrainian servicewoman Nadiya Savchenko is on board a plane returning to Ukraine from Russia, a source close to a deal to swap the pilot for two Russians held by Kiev said on Wednesday.

"They are coming back," the source said, confirming that Savchenko was on the plane.

(Reporting by Pavel Polityuk; Writing by Alessandra Prentice; editing by Matthias Williams)