BANGKOK (AP) — Oil prices have jumped and Asian shares are mostly lower after the U.S. carried out airstrikes and Iran retaliated. The prices of Brent crude and U.S. benchmark crude gained more than 3% early Monday. South Korea’s Kospi sank 9%. On Friday, U.S. stocks rose as Wall Street showed its appetite is still big for winners of the artificial-intelligence boom. The S&P 500 rose 0.4% and the Dow Jones Industrial Average added 0.3%. The Nasdaq composite climbed 0.3%. Shares of South Korean memory chipmaker SK Hynix soared 13% in their debut on Wall Street. Early Monday, Seoul-traded shares SK Hynix slumped 15.4%, while bigger rival Samsung Electronics lost 10.7%.