North Korean leader Kim Jong-un arrives at the railway station in Vietnam's Dong Dang on Tuesday to attend the second U.S.-North Korea summit in Hanoi. AFP

By Jung Min-ho

North Korean leader Kim Jong-un will stay in Vietnam for two extra days for a goodwill visit after his summit with U.S. President Donald Trump, according to the North's state media, KCNA, Wednesday.

"Kim will meet with Trump for their historic second summit on Feb. 27-28. And then he will conduct a goodwill visit to Vietnam on March 1-2," KCNA said.

The KCNA previously reported that Kim was planning to pay an official visit to North Korea's critical Southeast Asian ally, where the "leaders of the two countries will have a meeting and talks."

During his visit to the North Korean embassy in Hanoi Tuesday, Kim told staff to strengthen bilateral ties.

North Korea and Vietnam established formal diplomatic relations in 1950.

During the Vietnam War, North Korea provided military supplies and deployed its air force to North Vietnam, which was led by Ho Chi Minh. Since then, relations have had their ups and downs.

The two countries have become closer since Kim came to power, with some analysts speculating that he has Vietnam's reform model in mind to develop North Korea's economy.