Analyses about the Russian war on Ukraine have tended to focus on the displacement of agricultural commodity sales and input shortfalls. However, the Biden Administration’s belated concession to ban imports of oil from Russia was based on the more substantial economic and political risks involved.  At the narrow political level, relative voter happiness is correlated to the price of gasoline. The U.S. is headed into the summer driving season when gasoline demand will increase another 10-15 percent. The value of petroleum was already up 50 percent before the war, which is what emboldened Putin to act on Ukraine even if spring weather presented field problems for his mechanized divisions. Cutting off Russian oil supplies now at th...