Yemen’s civil conflict and the U.S.’s emerging nuclear deal with Iran are sowing divisions among the Obama administration’s key Arab allies and placing the White House in the cross hairs. The strains flared publicly on Wednesday when the Shiite leader of Iraq, a U.S. ally, accused another American ally, Sunni Saudi Arabia, of threatening a regional sectarian war by launching airstrikes against Iranian-backed insurgents in Yemen. In Washington on Wednesday, Iraqi Prime Minister Haider al-Abadi said the Saudi airstrikes made no sense and urged world leaders to quickly forge a cease-fire in Yemen, where the United Nations has voiced concerns about a growing humanitarian crisis. Iraqi Prime Minister Haider al-Abadi in Washington on Tuesday. “To me, there is no logic to the operation at all in the first place,” Mr. Abadi said during his first official visit to the U.S. since taking office in September. “What is the aim? […]