"The Polish president had been due in western Russia to commemorate the anniversary of the murder of thousands of Polish officers by the Soviet Union at the beginning of World War II.
The ceremonies were to be held at a site in the Katyn forest close to Smolensk, where 70 years ago members of the Soviet secret police executed more than 20,000 Polish officers captured after the Soviet Army invaded Poland in 1939."
It is worthwhile to emphasize these two paragraphs from the article, since presidency of the late president Kaczyński, among other things, has put great importance on reminding about Polish victims of Soviet totalitarianism. He insisted on commemorating the memory of victims of Sovet invasion on Poland, after the Germany, on 17.09.1939, as well as of Soviet occupation after 1945, when Russians defeated Germany in that part of Europe and replaced them in the role of the occupier. Memory about this victims has been prohibited until 1989, when Poland finally regained its political sovereignty.