Hanoi, Feb. 28 -- Senior members of North Korea's delegation to Hanoi for Kim Jong Un's summit with President Donald Trump took a side trip Wednesday to visit one of Vietnam's most successful conglomerates.

Kim has several senior foreign and economic advisers with him in Hanoi and gleaning insights into ways to improve the North's economy appears to be high on their list of priorities.

As Kim stayed behind to prepare for the summit, a motorcade with former Foreign Minister Ri Su Yong, who is now the ruling party's top foreign policy adviser, and O Su Yong, a ruling party vice chairman and director of its Economic Affairs Department, traveled by car to the port city of Hai Phong, about 105 kilometers (60 miles) east of Hanoi, for a tour ...