The president of the Kurdistan Regional Government (KRG) of Iraq, Nechirvan Barzani, traveled to Tehran on Monday to meet with Iranian President Ebrahim Raisi, who warned him to prevent “anti-revolutionary elements” from getting too friendly with the autonomous Kurdish region. The warning appeared to be a threat intended to dissuade Kurdish cooperation with the United States and any potential cordial ties with neighboring Israel. The KRG maintains friendly relations with the United States and cooperates militarily with Washington, particularly against the Islamic State (Isis) jihadist organization. The KRG’s Peshmerga forces were pivotal in the ouster of the ISIS “caliphate” from...