If you think Biden won't fight for Nato you're deluded, he can't fight for Ukrain because it's not Natos fight.
Nato, in particular the US and the UK are the ones suppling all the intellegence to Ukrain troops and are the main reason they know where to hit them the hardest, to great effect. Hitting them with US and UK weopons too.
To say Biden is not helping is a disgrace, politics should not come into this.
As for Trump, he is one of Putins puppets and it was widely believed he was taking the US out of Nato in a second term. It's obvious he was comprimised in some way when he went to Russia to build a trump tower there.
He is also funded by russian Money, hundreds of millions of dollars, that buys allegience.