"The controversy began on August 23, 1939, when a non-aggression treaty was signed in Moscow by German foreign minister Joachim von Ribbentrop and Soviet foreign minister Vyacheslav Molotov.More here,
The pact secured Soviet neutrality and consequentially sealed the fate of Poland, which was invaded by the German army on September 1, 1939. ...
...the 70th anniversary of the German invasion of Poland, Russian Prime Minister Vladimir Putin will speak in Gdansk, Poland, to defend the Soviet Union's policies vis-a-vis the war."
"70 years on, Poland's WWII wounds haven't healed ......the resentments that still bubble up from the war that broke out with Hitler's attack on Poland on Sept. 1, 1939. Today, as Polish, German and Russian leaders join on Tuesday to mark the anniversary, Polish-German relations are at one level an idyll of open borders and shared membership in the prosperous, democratic European Union.From AP.
But at another level, they are one rancorous episode after another: a Polish prime minister demanding greater voting power in European forums to make up for Poland's war-related loss of population; a German magazine article that stirs Polish outrage by saying Germany had the willing help of Poles and others in executing its genocidal actions."