President Volodymyr Zelenskyy's decision to name an elite special operations unit after "UPA Heroes" has sparked a major diplomatic crisis between Warsaw and Kyiv. Poland views the UPA as responsible for genocidal ethnic cleansing of Poles in the 1940s, while Ukraine remembers them as anti-Soviet resistance fighters. This unresolved historical dispute threatens Ukraine's EU accession and bilateral solidarity, with leaders urging cooperation to prevent Moscow from benefiting from the division.