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In page Katyn massacre:

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In June 1998, Boris Yeltsin and Aleksander Kwaśniewski agreed to construct memorial complexes at Katyn and Mednoye, the two NKVD execution sites on Russian soil. In September of that year, the Russians also raised the issue of Soviet prisoner of war deaths in the camps for Russian prisoners and internees in Poland (1919–24). About 16,000 to 20,000 POWs died in those camps due to communicable diseases.[4] Some Russian officials argued it was "a genocide comparable to Katyn".[5] A similar claim was raised in 1994; such attempts are seen by some, particularly in Poland, as a highly provocative Russian attempt to create an "anti-Katyn" and "balance the historical equation".[3][6] The fate of Polish prisoners and internees in Soviet Russia remains poorly researched.[citation needed]