"In recent days, we have again offered German doctors to Russia via diplomatic channels. We have not received a response so far, we are waiting," Martin Schaefer said. He reaffirmed Berlin's call for a "humanitarian" resolution to the case surrounding Savchenko.
The Russian Federal Penitentiary Service said earlier that Savchenko had given written permission for regular medical inspections, adding that the latest checkup found her to be in satisfactory health condition.
Savchenko was sentenced in late March after being convicted by a Russian court of directing artillery fire during the conflict in eastern Ukraine that led to the deaths of two Russian journalists, Igor Kornelyuk and Anton Voloshin, on June 17, 2014.
She refused to appeal the ruling, and her lawyers say Ukrainian authorities are attempting to organize her transfer.