The leaders of five Mekong countries and Japan held the 10th Mekong-Japan Summit on Tuesday in Tokyo, issuing a joint statement afterwards that pledged cooperation on the promotion of development programs and further improvement on "connectivity" and "quality infrastructure" projects in the region.

"This morning at the meeting we were able to review the Mekong-Japan cooperation process, particularly years between 2015 and '18," said Myanmar's civilian leader, Aung San Suu Kyi, during a joint news conference after the meeting at the State Guesthouse in Tokyo's Akasaka district.

"We all agreed that this has been very beneficial for both Japan and Mekong countries. Myanmar itself ... (has) benefited from over 16 bilateral projects and 100 multilateral projects as part of the Mekong-Japan cooperation," she added.