NEW YORK, June 1 : Global stocks clung to record highs on Monday as strong corporate results, fueled in part by artificial intelligence optimism, outweighed investor concerns over escalating U.S.-Iran tensions that have pushed oil prices higher. The U.S. said it struck Iranian military sites at the weekend and Iran's Revolutionary Guards said on Monday it had targeted a U.S. base in response. Also on Monday, Iranian news agency Tasnim said Iran is halting indirect negotiations with the U.S.