U.S. President Joe Biden should spend more time with Southeast Asian leaders during a summit in Washington next week if his administration is serious about elevating U.S. ties with the region, where China holds significant sway, a senior Cambodian official said on Friday.

No individual meetings were currently planned between the region's leaders and Biden when the 10-nation Association of Southeast Asian Nations (ASEAN) meets with him as a bloc for talks on May 12 and 13, said Kao Kim Hourn, a minister and close adviser to Cambodia's long-serving Prime Minister Hun Sen.

Cambodia holds the rotating ASEAN chair and up to eight leaders, including Hun Sen, are expected to attend the summit. Myanmar's leader has been excluded over a coup there last year and the Philippines will be in transition after an election.