Poland’s new president pledged to serve as a unifying force and work closely with European allies as he was sworn in Friday — but the ceremony was overshadowed by the plane crash that killed his predecessor and snubbed by his defeated...

Members of the Polish Sejm — the parliament of a nation in mourning — wept yesterday as they remembered the 18 deputies and senators who died with their President in Saturday’s air crash. Only one MP refused to shed tears: Jaroslaw Kaczynski, the...