KIEV, July 11. /TASS/. The Verkhovna Rada, Ukraine’s parliament, is drafting a response to a resolution passed by the Polish Senate, recognizing as genocide the mass killings of Poles by Ukrainian nationalists during World War Two, deputy head of the Rada foreign affairs committee and Batkivshchyna party member, Boris Tarasyuk announced Monday.

"We expect the Polish Sejm to officially mark July 11 as a national day of mourning dedicated to the victims of genocide carried out by Ukrainian ultranationalists. Regarding this matter, we are submitting a proposal this week to the Verkhovna Rada to approve a retaliatory statement," Tarasyuk declared at a session of the parliament’s Conciliation Board.

In response, the lawmaker branded the Polish Senate’s resolution as anti-Ukrainian.

"By approving the first-ever resolution dedicated to the victims of the Volhynia atrocity, the Polish parliament has crossed the boundaries of this tragedy," he said.

In the meantime, Rada Speaker Andrey Parubiy said that a special meeting should be convened to coordinate both the president’s and the parliament’s positions.

On Friday, the Polish Senate passed a resolution, urging the Sejm, the country’s lower house, to recognize the genocide of Poles committed by Ukrainian ultranationalists during World War Two.

The Senate urged the Sejm to declare July 11 a national day of mourning for the victims of genocide committed by Ukrainian nationalists against the citizens of the interwar Second Polish Republic (Polish: Druga Rzeczpospolita).

On the same day, while on an official trip to Warsaw, Ukrainian President Poroshenko visited the landmark memorial to the massacre of Poles and paid tribute to their memory.

On Monday, Polish President Andrzej Duda said the relations between Warsaw and Kiev should be based on the historical truth about the crimes committed in Volhynia by the Organization of Ukrainian Nationalists (the OUN), an ultra-right political party which operated predominantly in Western Ukraine during WWII, and the Ukrainian Insurgent Army (the UPA), established by the OUN.