A Polish grandfather left New York Sunday on his third solo trans-Atlantic crossing in a kayak, aiming to arrive in Portugal in time to celebrate his 70th birthday on firm ground in September.
Tens of thousands of protesters poured into Warsaw's streets for a demonstration organised by the far-right, marching under the slogan "Poland for the Polish" and burning an EU flag.
Poland is prepared to take Russia to court over what it sees as foot-dragging in the investigation of the 2010 air crash in which then president Lech Kaczynskidied.
Ukrainian Prime Minister Arseniy Yatsenyuk warned that any attempt to hold "unlawful" elections in rebel-run areas in the country's east would constitute a breach of a February peace deal.
Polish voters have opted for change and chosen the conservative and relatively unknown lawyer Andrzej Duda as their next president, spelling a possible return to power of his eurosceptic mentor.
Andrzej Duda, the 43-year-old conservative MEP and lawyer who won Poland's cliffhanger presidential election on Sunday, has strong ties to the powerful Kaczynski twins.