A member of the OSCE Special Monitoring Mission passed away in Kramatorsk, Donetsk Region, the Polish ambassador to Ukraine, Bartosz Cichocki, has said on Twitter.
"It was with great regret that I learned of the passing of Col. Czesław Kącki @OSCE_SMM monitor in Kramatorsk.
My deepest sympathies go to the family, Amb. Yaşar Halit Çevik and the SMM team," he tweeted.
The reason of the death is not disclosed.