I don’t think it will be enough but I’ll be happy to be proven wrong.

But what kind of support are they going to offer that changes the outcome?

Honestly while Rubio sucks and it’s not really his place to say this, it’s hard to imagine any peace deal that doesn’t have involve territorial concessions. It’s up to Ukrainians to decide whether that or continuing the war is worse but I just don’t see any other options. Ultimately, Russia has to agree to end the war somehow.