Savchenko on her way to Ukraine, Alexandrov and Yerofeyev on their way to Moscow

Russia has released jailed Ukrainian pilot Nadezhda Savchenko following a prisoner swap, local media say.

There has been no official confirmation but sources said she was swapped for Russian prisoners Yevgeny Yerofeyev and Alexander Alexandrov held by Ukraine.

The 34-year-old pilot was being flown from the southern Russian city of Rostov-on-Don to Kiev on board Ukrainian President Petro Poroshenko's plane, BBC reports.

Yerofeyev and Alexandrov were being flown from Kiev to Moscow on board a plane belonging to Russian President Vladimir Putin.