I found an article about Russia's military logistics problems very reassuring. https://warontherocks.com/2021/11/feeding-the-bear-a-closer-look-at-russian-army-

I found an article about Russia's military logistics problems very reassuring. https://warontherocks.com/2021/11/feeding-the-bear-a-closer-look-at-russian-army-logistics/ https://warontherocks.com/2021/11/feeding-the-bear-a-closer-... The author claims that Russia would be very slow to go beyond the borders of the former USSR because (1) Russia's forces are completely reliant on railroads and (2) the railroads in former-soviet states are a different track width from elsewhere in Europe.