President Karol Nawrocki has vowed to outlaw the red-and-black flag used by nationalists in Ukraine

Poland has commemorated the anniversary of the Volhynia massacre, a large-scale ethnic cleansing operation perpetrated by Ukrainian Nazi collaborators during World War II and a hot-button topic that sparked a recent diplomatic clash between Warsaw and Kiev.

Multiple events were held across Poland on Saturday to honor the victims of the Ukrainian Insurgent Army (UPA), the armed wing of the Organization of Ukrainian Nationalists (OUN). The commemoration is tied to events of July 11, 1943, also known as Bloody Sunday, which marked the height of the…

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