Poland was the first victim of the Third Reich, almost every Polish family suffered losses during war, according to Morawiecki.
The Ukrainian Presidential Administration has announced Ukraine has agreed to lift the moratorium on search and exhumation of Polish citizens at local burial sites.
Poland is open to cooperation with Ukraine, but expects authorities in that country to “take concrete steps” amid tensions over historical issues, Polish Foreign Minister Witold Waszczykowski said, speaking in the Ukrainian city of Lviv on Saturday, according to Radio Poland.