A wounded Ukrainian serviceman is evacuated on a stretcher by medical workers into a Bundeswehr plane at Borispol airport in Kiev on May 14, 2019. - 15 Ukrainian servicemen wounded in combats with the Russia-back separatists in the east of the country will be treated in Germany. 112 Ukrainian soldiers received treatment in German military hospitals from 2014 to 2019. (Photo by Sergei SUPINSKY / AFP)

A wounded Ukrainian serviceman is evacuated on a stretcher by medical workers into a Bundeswehr plane at Borispol airport in Kiev on May 14, 2019. - 15 Ukrainian servicemen wounded in combats with the Russia-back separatists in the east of the country will be treated in Germany. 112 Ukrainian soldiers received treatment in German military hospitals from 2014 to 2019. (Photo by Sergei SUPINSKY / AFP)

A wounded Ukrainian serviceman is evacuated on a stretcher by medical workers into a Bundeswehr plane at Borispol airport in Kiev on May 14, 2019. - 15 Ukrainian servicemen wounded in combats with the Russia-back separatists in the east of the country will be treated in Germany. 112 Ukrainian soldiers received treatment in German military hospitals from 2014 to 2019. (Photo by Sergei SUPINSKY / AFP)