Things could get fun if NATO gives Ukraine mounted indirect weapons & tanks.

Yes, it will be lots of fun to watch the Leopards, Abrams and Challenger tanks on fire.

Germany won't supply Leopards unless the US supplies some of their Abrams. The Americans don't want to supply Abrams to Ukraine and have their reputation for invulnerability destroyed, or having them get stuck in the mud. And nobody actually thinks the British Challengers are up to the challenge of facing modern weaponry.