Prime Minister Hun Sen on Monday left for a two-day official visit to Vientiane, to sign agreements trade agreements and attend a summit of Laos, Cambodian and Vietnamese leaders.

The two countries hope to develop investment on the border of Vietnam, in a zone called the Development Triangle Area of CLV, or Cambodia-Laos-Vietnam.

“The visit will strengthen bilateral friendship, and both prime ministers will negotiate and sign an agreement on the promotion and protection of investment,” said Sri Thamrong, a political adviser to Hun Sen.

The business exchange between Laos and Cambodia amounts to around $1 million, mainly in agriculture. The two neighbors hope to open two international gateways, at Stung Treng and Ratanakkiri provinces, to boost trade and tourism.