would rather sell their tanks, I am interested in buying. I offer 100 USD (soon to be 20M rubbles) in bitcoin upon receival of the tank keys
Just be warned, you may have to get some fuel with you when you'll try to get them home, as they seem to have .. certain supply issues

$100 is too low ball, imagine how much Uber would cost to get home from a war zone.
I don't think that the 1M offer is real, not many can afford that. I find this offer much more reasonable/real, it has better chance to be honored than the big 1M offer.
And with 100$ they can buy a ticket home and also have some change for a beer. Looks fair to me.