Here are five things to know about Poland, a NATO and European Union member of 38 million people that is holding the first round of its presidential election on Sunday.
Migration
Since Russia launched its full-scale invasion of Ukraine in 2022, Poland has welcomed hundreds of thousands of refugees from its war-torn neighbour.
According to official data, around a million Ukrainian refugees now reside in Poland, mostly women and children. Over 1.5 million Ukrainians have valid Polish residence permits.
Warsaw has also been one of Kyiv's staunchest allies, offering it political and military support.
But anti-migrant backlash has become a hot-button issue.
The ruling pro-EU coalition of Prime Minister Donald Tusk and the far-right opposition both now back curbing social benefits for foreigners -- including Ukrainians.
Poland also faced criticism from human rights groups after it suspended the right to seek asylum for migrants crossing the border from Belarus.
The Polish authorities have accused Russia and its ally Belarus of pushing thousands of migrants over their borders in recent years.
They have blamed Minsk and Moscow for "hybrid attacks" they say are orchestrated to destabilise the EU.
Military spending
Poland far outstrips NATO's two-percent-of-GDP defence spending target, with 4.7 percent of its economic output earmarked this year for military expenditure.
Next year, it aims to raise it further, to around five percent of GDP -- a level US President Donald Trump is pressuring allies to agree to.
Fearing threats from Russia, Poland has for several years rapidly modernised its military, with a string of arms contracts, mainly with the United States and South Korea.
Earlier this month, Poland also signed a new treaty with France, committing both sides to mutual assistance in case of an attack by an aggressor.
In March, the Polish government announced plans for a large-scale military training scheme designed to ensure that every adult man in the country could be trained in case of war.
The scheme -- open to both men and women -- will be voluntary. The government hopes to offer the training to 100,000 civilians a year starting in 2027.
People attend a final campaign rally of Slawomir Mentzen, a presidential candidate of the far-right Konfederacja alliance, at the Podgorski Square in Krakow, Poland on May 16, 2025. (Credit: AFP)