I think that's just a publicity stunt to make Russia more liked by the "rest of the world." In reality, the Russian government hates Islamist Muslims even more than we do (one word: Chechnya), and can't wait to see them crushed. I think they're just betting on the probability that the US won't even bother seeking such a resolution, and that even if we do, they can just abstain or be conveniently away from the UN that day so they can't vote at all.
You're right. It lets them grandstand and earn points. Means nothing since Bush will not submit this to the UN anyway. For all we know Bush and Putin arranged this in advance to give Vlad the chance to bolster himself politically.
BTW, Biden's statement means Congressional approval is a done deal. I look for Bush to make a big speech within 2 weeks followed by quick Congressional action.