The Vietnamese government leader's attendance is made at the invitation of Thai Prime Minister Prayut Chan-o-cha and Cambodian Prime Minister Hun Sen.
Vietnam officially joined the summit in 2004 during the first ACMECS ministers’ meeting, which was held in Thailand last year.The CLMV is an open cooperation mechanism aiming to promote potential and advantages of Cambodia, Laos, Myanmar and Vietnam, and call for support from other ASEAN countries and their partners for the four nations.