The four variables are: a. Ukraine's will to resist b. NATO's will to supply military arms c. Russia's will to continue the operation d. Russia's economy O

The four variables are: a. Ukraine's will to resist b. NATO's will to supply military arms c. Russia's will to continue the operation d. Russia's economy Of those, I'd bet (d) fails first. Nazi Germany (which was economically mobilized for total war) showed you can only keep the economic house of cards going for so long. And the Russian economy is not the German economy (then or now), nor has mobilized for wartime. It looks like it's doing okay, and the Russians loudly claim so and point at the Chinese and Indians buying crude and gas, but we'll see how long the veneer of "okay" lasts.