I don't believe so no it's not as black and white as that. Multiple things can be true at the same time. We need the US and also Europe isn't going to collapse to Russia either.
Can't just follow blindly what Trump want's for what? He might help, if the US can make a load of money from it but it wouldn't be certain even if we helped him in Iran.
He has said he cba re Ukraine already. Theyve took away majority of the assistance to Ukraine. European nations are the ones that stepped in to plug up the gap the US left supporting Ukraine. The major problem would be US withholding intelligence and information from Ukraine.