Russia is a net importer of foods only dollar (ok, ruble) wise. And that is immaterial in this context. Calorically, they produce far more than necessary to keep everyone well fed. And they can (and do) produce the precursors (fertilizer, etc) necessary to continue their agricultural production. This isn’t China, with a bloated population and severely degraded and limited arable land. You will not starve Russia.
Folks are really underestimating how well prepared Putin is, and how focused his preparations have been for this goal.
He is already stocked up-there’s no stocking up to be done. In that, you are mistaken. We are talking the largest country in the world here, with a plethora of resources. Their low population density is a benefit, not a liability. He truly has prepared for most contingencies; did you know Russia has developed their own microchip industry, mostly for this goal?
I hope you do not see my post as promotional. It is just realistic. I think it is imperative that Putin is destroyed. He needs to hang from the end of a rope. I just believe we need to be clear eyed in how horrible getting there will be. Outside of an internal coup relatively soon, this will be absolutely awful.