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A picture taken and released by Ukrainian Presidential Press-Service on July 8, 2018 shows Ukrainian leader Petro Poroshenko taking part in an opening of a memorial in tribute to Ukrainians killed by Polish partisans, in the Polish village of Sahryn. The presidents of Poland and Ukraine held separate ceremonies on Sunday marking 75 years since a WWII-era ethnic conflict between their nations claimed thousands of lives, as a row over history continued to sour relations between the neighbours. Discord over the Volhynia massacres between 1943 and 1945 has led to a diplomatic chill between Kiev and Warsaw, whose relations deteriorated after the nationalist Law and Justice (PiS) party came to power in Poland in 2015. Polish President Andrzej Duda attended a mass commemorating the Polish victims of the conflict in Lutsk, a city in Ukraine's western Volhynia region. / AFP PHOTO / Mikhail Palinchak / AFP PHOTO / UKRANIAN PRESIDENTIAL PRESS SERVICE / MIKHAIL PALINCHAK / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / " - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS