ALLIES SET TO IMPOSE ECONOMIC SANCTIONS ON TEHERAN MAY 17; Common Market Nations Agree to Act Unless 'Decisive' Gain Is Made on Hostage Issue Desire for Flexibility Shown EUROPEAN ALLIES SET DEADLINE FOR IRAN French Said to Have Yielded Terms of U.N. Resolution Heeded Hasty American Action Feared
LUXEMBOURG, April 22--After eight hours of wrangling, the foreign ministers of the nine members of the European Economic Community voted unanimously tonight to impose full economic sanctions against Iran on May 17 unless "decisive progress" is made to free the American hostages held in Teheran.