It was a denial of responsibility for the 1939 invasion of Poland, which started World War II. The tweet came as the Polish Embassy in South Africa commemorated the anniversary of the USSR’s invasion.
But Russian embassy in South Africa didn’t let Poland’s tweet go without a denial. Germany invaded Poland from the west, the USSR invaded from the east, and the two carved up Polish territory between them.
However, Business Insider reports the USSR did not formally declare war.
Full article here.