Władysław Sikorski was prime minister of the Polish Government in Exile during World War II.
In July 1943, Sikorski and almost all of his entourage were killed in a plane crash when it plunged into the sea immediately after takeoff from Gibraltar.
Sikorki's death was convenient for the western Allies, who were finding the Polish question a stumbling-block to preserving good relations with Stalin. (Władysław Sikorski - Wikipedia, the free encyclopedia)On 10 April 2010, Lech Kaczynski, the president of Poland, was killed in a plane crash in western Russia, "setting off a new cycle of grievances between Russia and Poland on a day that was supposed to serve the cause of reconciliation between them." (Plane Crash Kills Polish President: A Blow to Russia-Poland ... )
Kaczynski was regarded as skeptical of the European Union.
Kaczynski forged close relations with Ukraine and Georgia, determined to bring them closer to NATO.
"His defense of those two countries often upset leading members of the European Union, especially Germany, which was concerned that an expanded NATO would make Russia feel threatened and lead to new East-West tensions." (Kaczynski Often a Source of Tension Within EU)
Poland agreed to a Bush proposal to host parts of a global anti-missile system despite strong protests from neighbouring Russia.
Obama has not given a commitment to go ahead with these plans to build part of a US missile defence system in Poland.