◢ Iranian President Hassan Rouhani on Wednesday was on the  second leg of his European tour seeking assurances over the 2015 nuclear deal, a trip clouded by the arrest of a Tehran diplomat over an alleged bomb plot against opposition exiles in Paris. Hoping to boost economic cooperation to help offset the return of US sanctions following Washington's pullout from the historic deal, Rouhani arrived late Tuesday in Vienna—the city where it was signed.