IRAN resumed gas exports to the U.S.S.R. Apr. 9 through a 1,300 km pipeline from its southern fields to Astara on the Caspian Sea after an 11 year hiatus. The two countries last week signed a 15 year contract covering sales of 94 bcf/year as part of a $6 billion trade pact. Iranian exports could climb to 313 bcf/year under the agreement. The U.S.S.R. also agreed to allow use of its territory as a transit point for Iranian gas exports through Turkey to Europe.