The US ambassador in Warsaw came to Poland's defense on Monday following repeated claims by Russian President Vladimir Putin that Poland bears blame for the outbreak of World War II.
"Dear President Putin, Hitler and Stalin colluded to start WWII. That is a fact. Poland was a victim of this horrible conflict," Ambassador Georgette Mosbacher said on Twitter in English and Polish though not in Russian.
World War II began September 1, 1939, when Nazi German troops invaded Poland.
Two weeks later, the Soviet Red Army invaded from the east, in what Poles still call a "stab in the back."