Dude, almost everything you just said is exactly Ukrainian propaganda lol. Russia sent out a bunch of vehicles with enough fuel and logistics for 3 days and about week into the invasion, a whole lot of them were abandoned because they had no fuel, hence the videos of Ukrainian tractors pulling them to Ukrainian lines. That issue is over now since they're now in it for the long haul.

What ww2 tank are they using? I've been following this war since like the beginning and the worst is some t 50s which were are previous generation tanks but still do the job of heavy Armour well enough. They would get torn apart by an Abrams but America isn't sending those to Ukraine since Ukraine, like Russia, is a Soviet army. And buying cheap drones and millions of shells from your allies isn't exactly anything new in warfare.

NATO has trained maybe 10 to 20k Ukrainian troops so far. Ukraine has an army of 600 to 700k. That's a drop in the bucket right there.

Russia has been losing territory because of the massive Ukrainian manpower advantage which has been taking heavy causalities because Russia still has the firepower and artillery advantage. But the problem is thar Ukraine has already mobilized just about every person they could, Russia has not.