Tusk made the announcement in a social media address marking Poland's National Day of Remembrance for Poles killed in the atrocities perpetrated by Ukrainian nationalists.
He said July 11, 1943 — known as "Bloody Sunday" — marked the height of the Volhynia massacre, when units of the Ukrainian Insurgent Army, backed by parts of the local civilian population, attacked Polish villages in the Volhynia region.
"Those who were murdered cannot remain nameless, they cannot go without a dignified burial. Remembering them is our shared duty to their families, to the nation and to the Polish state", Tusk said.
He said his government had restarted, after years of delay, the search for and exhumation of victims of the Volhynia massacre and other 20th-century wartime victims in Ukraine whose remains have not yet been properly buried.
Tusk said the new monument would commemorate every victim found and identified. "That is why a Wall of Remembrance with an eternal flame will be built in Warsaw, bearing the name of every victim found and identified. The Republic of Poland will not forget a single one of them", he said.
"The answer to nationalism cannot be more nationalism"
Tusk said remembrance of the victims must be grounded in truth and dignified commemoration rather than mutual hostility.
"Our duty to the victims, and also our way of overcoming a painful past in favor of a better future, is truth. And truth means identifying and naming those responsible. It means an unequivocal condemnation of this crime", he said.
He added that "the answer to nationalism cannot be more nationalism", and that truth, remembrance and hope should form the foundation of future relations. Referring to relations with Ukraine, Tusk said Europe's peace and reconciliation had been built on truth, and that any country seeking to belong to that Europe must be ready to accept it.
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Source: Polish Radio