Russia has published previously secret documents on the 1940 Katyn massacre, in which some 22,000 Polish officers were killed by Soviet forces.
The state archive said the “Packet No. 1” documents had until now only been available to specialist researchers.
The Soviet Union denied its role in the massacre for decades.
The documents that the state archive published were declassified in the 1990s though only specialist researchers had access to them, reports said.
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