Maybe I spoke too soon. Now it does seem like August, 1939, after all.
Attacking a country that is in the armpit of Russia, a place that has barely known independence and was heavily colonized by Russia for hundreds of years, is one thing. Attacking Poland, a member of the EU and NATO, presumably by first crossing the territory of the independent Ukraine, is a different matter entirely. That would mean war with the West.
If Putin's generals actually reflect the thinking of the Kremlin, we're facing the most dangerous crisis of the post-war era.