I resti dell'aereo con a bordo il Presidente polacco Lech Kaczynski diretto a Katyn

FILE - In this April 13, 2010 file photo, emergency ministry workers stand near the wreckage at the site of the plane crash that killed Polish President Lech Kaczynski in Smolensk, western Russia. Russia’s state archives posted documents Wednesday, April 28, 2010 about the Soviet Union’s World War II massacre of more than 20,000 Polish officers and other prominent citizens. Relations between Russia and Poland have warmed following the plane crash that killed President Kaczynski on a flight to visit the Katyn forest in western Russia for a memorial ceremony on the 70th anniversary of the massacre. (AP Photo/Mikhail Metzel, file)