Hong, who doubles as South Korea's deputy prime minister, said Seoul will set up a "cooperative center" in Vietnam to make sure that infrastructure projects, including an airport, will succeed in Vietnam through the participation of South Korean builders.

South Korea and Vietnam "agreed to actively cooperate to ensure South Korean companies can participate in large-scale infrastructure projects in Vietnam," the Ministry of Economy and Finance said after the talks.

The talks were meant to assess the progress of agreements reached at Moon's summit talks with Vietnamese President Tran Dai Quang in Hanoi in March last year.

The summit deals called for, among other things, boosting bilateral trade to US$100 billion by 2020.

In 2018, the bilateral trade volume came to $68.3 billion, a dramatic hike from $500 million in 1992, when the two sides established diplomatic relations.

South Korea is Vietnam's second-largest trading partner, and Vietnam is South Korea's fourth-largest trading partner. Vietnam is home to more than 7,000 South Korean companies, including tech giant Samsung Electronics Co.

South Korea and Vietnam agreed to expedite negotiations to revise their double taxation avoidance pact that was signed in 1994. The two sides hope to sign a revised pact on the sidelines of the special summit between South Korea and the 10-member Association of Southeast Asian Nations in November.

ASEAN comprises Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Thailand, Singapore and Vietnam.

Hue also called for increased economic cooperation with South Korea, calling South Korea the most important partner of Vietnam.

South Korea has sought stronger economic ties with Southeast Asian countries to reduce its heavy reliance on large markets like the United States and China and to foster new growth drivers. (Yonhap)