Jaroslaw Kaczynski (R, Front), the chairman of the Polish ruling Law and Justice Party, attend the ceremony marking the seventh anniversary of the plane crash in Smolensk of Russia, at the Warsaw Powazki Military Cemetery in Warsaw, capital of Poland, April 10, 2017. Poland marked on Monday the seventh anniversary of the plane crash in which 96 Polish people, including the then-Polish President Lech Kaczynski, were killed. (Xinhua/Jaap Arriens)
