An Associated Press correction last week and reactions to it show that the question of whether the Soviet Union and Nazi Germany were allies at the dawn of World War II remains a hot-button issue for many Russians and eastern Europeans. The correction was issued to an article about a Holocaust commemoration in the Ukrainian city of Lviv that originally called the Soviet Union and Nazi Germany “former allies.” The AP concluded that the pact reached on Aug. 23, 1939 by the German and Soviet foreign ministers Joachim von Ribbentrop and Vyacheslav Molotov didn’t constitute a formal alliance, thus the...