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A monument commemorating the late Polish President Lech Kaczinski and the Smolensk tragedy is seen in Budapest, Hungary, on April 6, 2018. Polish leaders along with Hungarian Prime Minister Viktor Orban took part in an unveiling ceremony here Friday of a monument commemorating the late Polish President Lech Kaczinski and the Smolensk tragedy in which he died. In 2010, a military plane travelling from Warsaw carrying the late president and other Polish officials crashed in Smolensk, Russia killing 96 Polish people. (Xinhua/Attila Volgyi)