Everyone seem to have forgotten another point
. Spain has plenty of vineyards, not to talk about France, Italy, California, Hungary, Chile, Australia (even Vermont as some and the guy makes a failry good ice wine) ...
That will produce a lot of ethanol and actually it already does. However, much less than 50 years ago as it has become a great sin to be drunk.
People are currently talking about second generation bioethanol gas using waste parts of the plants. I found that funny, as the industry with which I was working 15 years ago was already producing ethanol from the parts of grapes that remains when you are making wine. of course it was not fuel but still it was ethanol. Building what you need to do it is not that difficult getting a pure product is a little harder, then. The smell is hard too as the decaying process is fairly long but, after armageddon, who cares? Personnaly, I find insane to grow corn to make fuel; who is the jerk who came up with that idea.
Russia will be fine, tanks will run on vodka, and that won't change much for the crew.
For oil, you just need a stone basket and a round stone press
. Every little village in the Douro Valley of Portugal still has one of these things.
In my own village of the south of France, I know at least 5 or 6 people who could produce one or another (in small quantity but they still can).
I also bet that people living in some remote places of the US retain such capacity.
By the way, I'm not sure if it is the case with the Leclerc, but the AMX-30s were known to run on about anything but water.
I forgot one, I met an old man (probably dead by now) who whas making a terrific 78% calva from apple. That was not his strongest and trust me he didn't know anything about technology.