<P> Władysław Eugeniusz Sikorski (Polish pronunciation: (vwaˈdɨswaf ɕiˈkɔrskji) (listen); 20 May 1881--4 July 1943) was a Polish military and political leader . </P> <P> Prior to the First World War, Sikorski established and participated in several underground organizations that promoted the cause of the independence of Poland from the Russian Empire . He fought with distinction in the Polish Legions during the First World War, and later in the newly created Polish Army during the Polish--Soviet War of 1919 to 1921 . In that war he played a prominent role in the decisive Battle of Warsaw (1920). In the early years of the Second Polish Republic, Sikorski held government posts, including serving as Prime Minister (1922 to 1923) and as Minister of Military Affairs (1923 to 1924). Following Józef Piłsudski's May Coup of 1926 and the installation of the Sanacja government, he fell out of favor with the new régime . </P> <P> During the Second World War, Sikorski became Prime Minister of the Polish Government in Exile, Commander - in - Chief of the Polish Armed Forces, and a vigorous advocate of the Polish cause in the diplomatic sphere . He supported the reestablishment of diplomatic relations between Poland and the Soviet Union, which had been severed after the Soviet pact with Germany and the 1939 invasion of Poland--however, Soviet leader Joseph Stalin broke off Soviet - Polish diplomatic relations in April 1943 following Sikorski's request that the International Red Cross investigate the Katyń Forest massacre . </P> <P> In July 1943, a plane carrying Sikorski plunged into the sea immediately after takeoff from Gibraltar, killing all on board except the pilot . The exact circumstances of Sikorski's death have been disputed and have given rise to a number of different theories surrounding the crash and his death . Sikorski had been the most prestigious leader of the Polish exiles, and his death was a severe setback for the Polish cause . </P>

Who was the leader of poland in ww2
find me the text answering this question