France, Aug. 6 -- Karol Nawrocki's inauguration as Poland's new president on Wednesday has set the stage for a turbulent power struggle with Prime Minister Donald Tusk's pro-European government and raised fears among Poland's Ukrainian community.

The historian and author used his swearing-in speech to parliament to make his position clear: "No to illegal immigration, no to the euro."

Nawrocki's election campaign was marked by a rise in nationalist rhetoric and repeated criticism of Ukrainian refugees living in Poland. His victory has unsettled many at home and abroad.

His rhetoric is making it easier for people to express anti-Ukrainian views, warned Oleksandr Pestrykov of the Ukrainian House Foundation in Warsaw - calling it a form of...