A backdoor risk refers to a hidden method of bypassing normal authentication or security controls.
Both leaders laughed and Lee clapped his hands as they proceeded with the presentation of gifts.
Chinese President Xi Jinping gifted South Korea's President Lee Jae Myung a pair of Xiaomi smartphones and jokingly urged him to "check if there's a backdoor," during a state visit on Saturday that capped the Asia-Pacific Economic Cooperation (APEC) forum.
Lee hosted Xi at a state summit and dinner after the APEC leaders' meeting in the South Korean city of Gyeongju, marking Xi's first visit to the U.S. ally in 11 years.
