"We have received Savchenko's documents from the Federal Penitentiary Service," he said at the St. Petersburg International Legal Forum on Wednesday.

As UNIAN reported earlier, on March 22, Russia's Donetsk city court in Rostov region sentenced Savchenko to 22 years in prison for the alleged murder of two Russian journalists.

Read alsoSavchenko pays fine imposed by Russian courtIn late April, Ukrainian President Petro Poroshenko told Ukrainian TV channels that he "firmly hoped" that the presidential plane would bring the illegally convicted Savchenko back home from Russia within a few weeks.

On April 27, Savchenko's lawyer Ilya Novikov claimed his client had reportedly received documents for extradition to Ukraine and projected she might return home in the latter half of May.