No doubt Russia hasn’t deployed it’s full force so far. But they must have thought they were deploying enough force to get the job done without embarrassment. So far that appears to have been a miscalculation, the Ukrainians with a modest amount of modern weaponry have been surprisingly effective.
A tank column in open ground is no longer invulnerable, even though they are still a potent weapon in cities. But getting there looks quite tricky. Certainly the notion that Russian tank columns could storm through Europe has been discredited. If NATO spends in proportion to it’s GNP there is no reason the Russians can’t be stopped by conventional weapons.
This is an important discovery which hasn’t been much discussed, but should make negotiations easier.
Likewise helicopters are being shot down in the combat zone…defensive weaponry seems to be confounding traditional tactics
There has been so little conflict between first world military powers since WW2 that the effect of new weaponry is not settled. The Falklands provided similar lessons showing the vulnerability of the fleet to Exocet missiles. But the US still sails carriers into trouble spots as if nothing can touch them.
If the Ukraine shows a determined country can defend their territory quite effectively with relatively accessible weaponry perhaps it isn’t the worst finding.