Bronislaw Komorowski was sworn in the new President of Poland on Friday.
In a ceremony held at the joint session of the two Houses of Parliament in Warsaw, the 58-year-old moderate politician officially took oath of office.
His inauguration was cleared on Tuesday by the Polish Supreme Court when it declared the country's presidential election valid, RTTNews reports.
Bronislaw Komorowski's inauguration before Poland's parliament came after a moment of silence for Lech Kaczynski and the 95 other people killed in the crash near Smolensk, Russia, on April 10.
In the first speech of his five-year term, Komorowski pledged to work to help modernize Poland, promoting scientific research and working to improve the creaky state health system. The pro-European Union leader also said his first official trips abroad would be to Brussels, Paris and Berlin.
He also pledged to support an ongoing rapprochement with Russia, the huge eastern neighbor with which post-communist Poland's relations have sometimes been tense, according to The Associated Press.