TEHRAN, Iran — U.S. allies on Wednesday lined up behind President Barack Obama's new policy aimed at reducing the likelihood of nuclear conflict. But Iran — classified as a possible target under the guideliness — dismissed it as a "cowboy" policy by a political newcomer doomed to fail. Russian President Dmitry Medvedev, in the Slovak capital Bratislava for an official visit, did not address the issue before leaving for Prague to sign a landmark treaty Thursday with Obama aimed at paring U.S.-Russian strategic nuclear weapons by 30 percent. But Washington's supporters in Asia and Europe welcomed Obama's pledge Tuesday to...