Asian stocks were mostly lower on Wednesday, taking their lead from weaker U.S. shares, while the dollar slid against the yen as Tokyo’s Nikkei recoiled in volatile trade. Crude oil prices continued to decline as negotiations between Iran and world powers over nuclear technology extended beyond a deadline. Asia’s decliners included South Korean, Australian, Malaysian and Indonesian stocks. MSCI’s broadest index of Asia-Pacific shares outside Japan stood little changed, meandering in and out of the red.