Negotiations grind on toward a fourth U.N. Security Council sanctions resolution against Iran's nuclear weapons program, even as President Mahmoud Ahmadinejad arrives in New York to address the Non-Proliferation Treaty review conference. Sanctions advocates acknowledge that the Security Council's ultimate product will do no more than marginally impede Iran's progress. In Congress, sanctions legislation also creaks along, but that too is simply going through the motions. Russia and China have already rejected key proposals to restrict Iran's access to international financial markets and choke off its importation of refined petroleum products, which domestically are in short supply. Any new U.S....