Open this photo in gallery: A decommissioned pumpjack sits idle beside a functioning one near Carstairs, Alta., on April 1. Just as the Allies once choked off Nazi access to oil, Canada must now help cut the financial lifeline of Vladimir Putin’s war.Jeff McIntosh/The Canadian Press John McKay is a former member of Parliament for Scarborough–Guildwood and a former chair of the Standing Committee on National Defence. Marcus Kolga is the founder of DisinfoWatch and a senior fellow at the Raoul Wallenberg Centre for Human Rights. One of the lesser-known subplots of the Second World War was the Nazi regime’s...