Russia blames Western powers for their "betrayal" of Europe in signing the 1938 Munich Agreement that allowed the Nazis to take Czechoslovakia.
A Russian senator has even suggested that Polish politicians in favor of the law should be placed under sanctions.
Should Moscow pay Vilnius, or Vilnius pay Moscow, for World War II?
Ukraine's general prosecutor said it will charge Stalin and Lavrenti Beria over 70-year-old crimes, and is still investigating the mass starvation of 1932-33.
Antoni Macierewicz delivered a speech commemorating the end of World War II in Europe.
Independent polls have also found that nearly a majority of Russians find kind words to say about Stalin.
The Kremlin has called for initiatives at home and abroad to spread Russian history, particularly regarding its role in World War II and defeating the Nazis.
Polls show the majority of Russians want Lenin buried but will Putin listen?
President Vladimir Putin has previously been critical of the Soviet state's founder, but Russians don't seem to agree.
The Euroskeptic political scientist has Brussels politicians worried.
Putin hailed the 90-year-old's "sincere love" for Russia. He died on Saturday.
The 1917 events will be commemorated in the country with the involvement of the Ministry of Culture.
The Soviet Union's last leader gave a rare interview on the 25th anniversary of its collapse.
The Mask of Grief monument was built in 1996 at the site on the route to a labor camp.
"Everything is about Russia taking back territory that was historically Soviet."
Both countries' parliaments voted to consider the Soviet-Nazi pact as the reason for the war.