The effort, scheduled to run from July 13 to August 7, will be followed by the reburial of the victims' remains, Ukraine's Institute of National Remembrance said in a statement on Friday.
The former villages of Ostrówki and Wola Ostrowiecka, once part of Poland's eastern Volhynia region, are now in Ukraine's Volyn region near the city of Kovel, after borders shifted following World War II.
The Ukrainian state-run institute said the excavation would be carried out by a Ukrainian archaeological company with the participation of specialists from Poland's Institute of National Remembrance (IPN) and the Wrocław Medical University in southwestern Poland.
Experts from a Ukrainian municipal organization specializing in the search for war victims will provide technical support and oversee the work, the institute said.
The project is being carried out under agreements reached by the Polish-Ukrainian Working Group on Historical Memory.
In its statement, the Ukrainian institute said that "shared remembrance and a willingness to reach understanding bring our nations closer together," based on Christian values, respect for human rights, good-neighborly relations in Europe and opposition to "Russian imperialism."
Preliminary search work was carried out at the site in April, following earlier archaeological and exhumation efforts that, according to the Polish IPN, led to the recovery of the remains of 674 Polish victims killed on August 30, 1943.
Polish historians say the victims were murdered by the Ukrainian Insurgent Army (UPA), the armed wing of the Organization of Ukrainian Nationalists (OUN), during what is known as the Volhynia massacres.
The legacy of the UPA remains one of the most contentious issues in Polish-Ukrainian relations.
Poland classifies the mass killings of Polish civilians in Volhynia and eastern Galicia between 1943 and 1945 as genocide, estimating that more than 100,000 Poles were killed in what was then Nazi-occupied eastern Poland and is now western Ukraine.
Many Ukrainians, however, regard the UPA as a symbol of their country's struggle for independence and its postwar resistance to Soviet rule.
Historical disputes have strained relations between Warsaw and Kyiv in recent months, particularly after Ukrainian President Volodymyr Zelensky named a military unit after the "Heroes of the UPA," prompting criticism from Polish leaders.
The dispute escalated after Polish President Karol Nawrocki stripped Zelensky of the Order of the White Eagle, Poland's highest state honor. Zelensky returned the decoration the following day.
Despite the disagreement, Nawrocki said after meeting Zelensky on the sidelines of the NATO summit in Ankara this week that Poland and Ukraine continued to share the view that Russia poses the main threat to their security, although the two leaders did not resolve their differences over historical issues.
The Volhynia region, then part of Poland, was occupied by the Soviet Union in 1939 under the Molotov-Ribbentrop Pact before being seized by Nazi Germany in 1941.
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Source: IAR, PAP