New circular to help boost Vietnam-China border tradeA newly-issued circular on foreign exchange management is expected to promote border trade between Vietnam and China. Payment can be made through banks or in cash in dong or yuan, according to the circular. Vietnam has seven provinces sharing the border with China, including Lang Son, Quang Ninh, Ha Giang, Lai Chau, Lao Cai, Cao Bang and Dien Bien. The Chinese yuan and Vietnamese dong are only used for payment in border areas of these provinces. Vietnam has overtaken Malaysia to become the largest trade partner of China in the Association of Southeast Asian Nations (ASEAN).