This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. US Dow futures dropped 400-570 points overnight, S&P 500 futures were down 1 per cent, while Nasdaq futures were down more than 1 per cent as the United States and Israel’s military campaign against Iran continued on Monday. Asian markets also opened lower amid fears of a broader Middle East escalation disrupting global supply chains and energy. China’s stock...