A historical feud threatens a key wartime alliance for Ukraine

Poland says it’s taking a stand over a bloody massacre.

Poland says it’s taking a stand over a bloody massacre. Ukraine says it’s a needless affront to a nation fighting for survival.

Limited time: Save 25% on NBC News subscription

Get exclusive reporting, live Q&As and ad-free reading.

Kyiv and its allies may be feeling pretty good about the present state of the war with Russia, but an intense historical feud has reignited, threatening relations between Ukraine and one of its most ardent backers.

The dispute between Warsaw and Kyiv comes just as Europe has re-engaged the United States in pressuring Moscow to end the war, with officials on the continent warning the neighbors’ tensions would play into the hands of President Vladimir Putin.