"Ukrainian doctors have gone in to meet with Nadia Savchenko," Feygin said on Twitter on Saturday.
Ukrainian Foreign Minister Pavlo Klimkin has confirmed this information.
"Ukrainian doctors are already with Nadia thanks to the joint efforts made by Poroshenko and our consul," he said on Twitter.
Nadezhda Savchenko, 31, was taken hostage by separatists in July 2014 during the fighting in Donbas and sent to Russia. She is charged with the deaths of two Russian journalists. Savchenko, when she was in a prison, was elected deputy of the Verkhovna Rada and then a member of the Ukrainian delegation to PACE. On February 10, the Basmanny District Court, Moscow extended the detention of the Ukrainian pilot until May 13.