On the Day of Remembrance for victims of the Volyn tragedy, Polish President Karol Nawrocki has called for a legislative ban in Poland on the red-and-black flag of the Ukrainian Insurgent Army. [The Volyn (Volhynia) tragedy was a series of events that led to the ethnic cleansing of the Polish and Ukrainian populations in 1943 during World War II. It was part of a long-standing rivalry between Ukrainians and Poles in what is now Ukraine's west. Poland considers the Volyn tragedy a genocide of Poles – ed.]

Polish Prime Minister Donald Tusk said he hopes Ukrainians will rethink their approach to the Volyn tragedy and urged people in Poland to avoid inflaming emotions. [The Volyn…

As Poland observes a day of remembrance for the victims of a Ukrainian nationalist military unit, there are increasing signs that it could cut off its neighbor from military aid,…