Chinese Foreign Minister Wang Yi is on Southeast Asia tour to deepen ties at a time of growing "risks and challenges". Also on East Asia Tonight, Beijing rebukes US criticism after Washington accused it of pressurising African countries into blocking overflight access for Taiwan leader William Lai. Meanwhile South Korea's special envoy meets Iranian foreign minister in Tehran. 00:00 Introduction 01:52 Wang Yi wraps up Cambodia visit 06:55 China refutes US criticism on William Lai's cancelled