Yeah, basically the US can decide who gets how much of an advantage in this war by simply dialing up or down their military aid.
Ukraine not willing to negotiate? Dial it down. Russia not willing? Dial it up.
So they can end this war if they are willing to invest accordingly. But not this conflict. Will that lead to a stable peace, or just another war in the near future? Without satisfying answers to these questions, Ukraine is probably better off to keep fighting, even without any US aid, which repeals the first sentence of this paragraph.
It is frequently discussed to ban far-right parties. Decades ago, the NPD could have been banned but it was turned down because they were too insignificant (only getting a few percent in elections, if at all).
With the AfD, it’s a different story. They are rather too significant (getting double digit percents). Politicians are worried that if a ban fails, it could give them even more fuel. Some subconscious thought nags me that this wasn’t the actual reason, but it’s the best I can do right now.