Sajdik said this on June 1, after the meeting with representatives of the Trilateral Contact Group in Minsk, Radio Liberty reports. "I am particularly concerned by the ceasefire violations which led to the military and civilian casualties, as well as the recent deliberate violations against unarmed personnel and assets of the OSCE SMM," Sajdik said. As reported, the situation in ATO area in Donbas has recently escalated. According to the Ukrainian side, 26 Ukrainian servicemen have been killed there since the beginning of May.