In France for 50-60 years when there were health crises, the government lied to society. When Chernobyl happened in 1984, the German authorities told to be careful and to protect oneself, and the French minister said all is well, the Chernobyl cloud stopped at the French border.
The current Polish authorities have made Russophobia one of the cornerstones of their policies, constantly speaking about the ‘Russian threat’ and trying to portray their country as a victim of both Nazi Germany and the USSR in World War II.
Recurring pro-Kremlin disinformation narrative equating criticism of Russia's actions with an irrational hatred of Russia itself; attempting to distort the events of the Second World War and rewrite its history in a way that is favourable to Russia.
The Nazi-Soviet occupation of Poland is a matter of historical record, not of portrayal. The invasion was coordinated on the basis of the the Molotov-Ribbentrop Pact, which was accompanied by a secret supplementary protocol on the delimitation of areas of mutual interest in Eastern Europe. A separate provision of the protocol entitled the Nazi Germany and the USSR to jointly conduct a "territorial-political reorganisation" of Poland, and to determine "whether it is in the (signatories') mutual interest to preserve the independent Polish State."
Read more about the Pact here.