Karol Nawrocki’s victory underscores the enduring appeal of nationalist rhetoric among about half of the country along the eastern flank of NATO and the European Union.

The victory of nationalist Karol Nawrocki in Poland's presidential election looks set to strain relations with Ukraine and embolden Donald Trump-inspired conservatives in central Europe, analysts and diplomats said on Monday.

Karol Nawrocki, the conservative Trump-backed candidate in Poland's runoff election, has narrowly won the presidential race. Charles Kupchan, a senior fellow at the Council on Foreign Relations, breaks down how the election results may affect NATO and Poland's relationship with the European Union.