The U.S. National Nuclear Security Administration has requested no funds for the reliable replacement warhead program, which means that Barack Obama has largely eschewed a reeplenishment and update of the US nuclear arsenal.
They are seeking $143 to develop advanced validation methods of existing warheads, but one of the promises inherent in the Nuclear Non-Proliferation Treaty was that the nuclear powers would gradually denuclearize themselves, and it appears that this is a big step towards this.