Giving up nukes, and remaining neutral, is also the conditions for their liberation granted by USSR/Russia. Germany asking US to end its occupation is going to need the US to be allowed to take their weapons for them to agree peacefully.

The reluctance to authorize long range missile strikes into Russia is based on the fear of nuclear strikes on the US/authorizers. The war was always meant to keep oil prices high and trickle through weapon sales until the last Ukrainian.