Judith Ingram at AP filed a report which contained among other things the following:
Putin used his speech at the [Auschwitz] ceremony to respond to calls by leaders in the Baltic states for Moscow to renounce the secret addendum to the Nazi-Soviet Non-Aggression Pact, known as the Molotov-Ribbentrop Pact, which Nazi and Soviet leaders concluded in 1939 to divide up much of Eastern Europe, including Poland, in case war broke out.
Shortly after German troops entered Poland in September 1939, Soviet troops occupied the country's east. Soviet forces then occupied the Baltic States of Latvia, Lithuania and Estonia in June 1940 but were driven out by the Germans a year later. The Red Army retook the Baltics in 1944, and reincorporated them into the Soviet Union. The Baltic states gained independence only after the 1991 breakup of the Soviet Union.
If Russia were to renounce the secret pact, it would tacitly be acknowledging some responsibility for World War II -- a stance seen as sacrilege in a country that lost some 27 million people during the conflict.
"Standing on this tormented soil, we should firmly and unequivocally say that any attempts to rewrite history and put victims and their killers, liberators and occupiers on an equal footing are immoral and unacceptable for those people who consider themselves Europeans," Putin said, referring to the Baltic states' recent entry into the European Union.