Poland's relations with Russia and Ukraine are rooted in a historic struggle for national identity. But with the fall of the Soviet Union, Poland and Ukraine moved closer together, with Warsaw immediately recognizing the Ukrainian border with Russia’s invasion in 2022.

As Poland turned to democratic and Western values and became a full member of the EU and NATO, the country saw the number of Ukrainians coming to work in the country grow rapidly, and visa restrictions were lifted in 2017. Since Russia's invasion, Poland has been one of Ukraine’s most committed supporters; its border a hub for...