Nationalist opposition candidate Karol Nawrocki narrowly won Poland's presidential election, results showed Monday, delivering a major blow to the centrist government's efforts to cement Warsaw's pro-European orientation.

The country’s government is centrist, with deep ties to Brussels. Its new president is a Trump-backed nationalist. That reflects a broader struggle.

Warsaw’s liberal mayor and his insurgent populist challenger are locked in a dead heat as they fight for the presidency of Poland, exit polls projected after Sunday’s head-to-head vote, leaving the country tilting between two wildly different political futures.

Nordic, Baltic and central European NATO members are committed to Ukrainian membership of the military alliance, the leaders of Poland, Romania and Lithuania said following a summit of the so-called B9 and Nordic countries on Monday.

Poland, a leading example of economic growth and increased military spending in Europe, will vote in a presidential runoff Sunday in a race that remains too close to call.