Given that the United Nations has declared Russia's hostile actions and military invasion of Ukraine sovereign territory as illegal and that Russia's strong-armed, military backed "succession vote" in Crimea would violate the Ukrainian constitution and international law - the U.S. should propose to the U.N., that Russia's seat (and vote) on the Security Council be suspended until such time as Russia removes it's troops from the Ukraine (with the exception of those that were stationed at Russian Navel bases before they manufactured this crises) and ceases it's attempts at what is in effect an illegal "land grab".
In short - if you refuse to abide by the rules and declarations of the United Nations you should have no say in the creation or implementation of those rules and declarations.