How do you sustain a 40 mile long convoy on an open ended mission in hostile territory ?
With 200 hundred of these
https://nationalinterest.org/blog/reboot/meet-russia%E2%80%99s-version-10-warthog-su-25-198809
and 150 more of these
https://www.wearethemighty.com/popular/ka-52-best-attack-helicopter/
Of course, the Russians have been so mauled by the Ukrainians that perhaps Putin is saving them to stop the Ukrainian juggernaut as it rolls onto Moscow to give Putin his comeuppance.
How do you sustain a 40 mile long convoy on an open ended mission in hostile territory ?
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If they had just been EV vehicles!