Katyn massacre
http://en.wikipedia.org/wiki/Katyn_massacre
On 13 April 1990, the forty-seventh anniversary of the discovery of the mass graves, the USSR formally expressed “profound regret” and admitted Soviet secret police responsibility. That day is also an International Day of Katyn Victims Memorial.
After Poles and Americans discovered further evidence in 1991 and 1992, Russian President Boris Yeltsin released the top-secret documents from the sealed “No. 1.” and transferred them to the new Polish president Lech Walesa, Among the documents was a proposal by Lavrenty Beria dated with 5 March 1940 to execute 25,700 Poles from Kozelsk, Ostashkov and Starobels camps, and from certain prisons of Western Ukraine and Belarus, signed by Stalin (among others); an excerpt from the Politburo shooting order of 5 March 1940; and Aleksandr Shelepin’s 3 March 1959 note to Nikita Khrushchev, with information about the execution of 21,857 Poles and with the proposal to destroy their personal files.
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