The USA is currently supporting Russia more than Ukraine, and Germany is disobeying.

But which USA are you talking about? Currently it is ruled by such an extremist party where some members declared love for Putin (and others are cowardly just "following orders" because they like their power and paycheck).

The former Warsaw Pact countries are aware capitulating to Putin would mean they're next, so they're vocal against EU surrender. Further, if East Europe gets threatened, West Europe knows it'll have a mother of a refugee crisis - even if Ukraine falls they'll have one.

Anyway, that's all to say currently USA's geopolitical interest seems to be "Trump Tower Moscow", and Germany is not going to go along with that.