The U.N. treaty was signed after weeks of negotiations that were not attended by any of the nine nuclear-armed states, which include America, Russia and North Korea.
Analysts say Kim's government believes nuclear weapons are key to its own survival and could be used to wrest concessions from the United States.
As the "Last Week Tonight" host points out, it's not Iran or North Korea we have to worry about; it's America.
The five nuclear-legal countries -- China, France, Russia, Britain and the U.S. -- are deploying new nuclear weapon delivery systems or have indicated the existence of programs that would, an authoritative study says.
Although the outcome of this fall's midterm elections didn't suggest great possibilities for the last two years of President Obama's term, he would like to suggest, as he does in this speech after Wednesday's START vote, that .
Atop Wednesday's to-do list in the Senate was a vote on the proposed and revised version of the U.S.' Strategic Nuclear Arms Reduction treaty with Russia, which was running up against resistance from some Republicans in the chamber but still seemed likely to pass.