The Obama administration erred badly in announcing its new nuclear posture only days before the treaty signing, since this will frame the treaty-ratification debate. Senators will have legitimate concerns over how the treaty will be implemented within the new nuclear framework, especially since the strategic shift came after the treaty had been negotiated. The administration will have a hard time justifying the disconnects between treaty and strategy. The treaty's warhead limit is a case in point. America will reduce its warhead stockpile, but the Obama administration has also unilaterally pledged not to modernize the U.S. nuclear force. This concession opens...