Cross-border freight train operations between China and North Korea appear to have resumed after a five-month suspension, South Korea's unification ministry said on Monday.

The comments from the ministry, which handles relations with North Korea, came after Yonhap news agency reported a freight train from Dandong crossed a bridge to the North Korean city of Sinuiju.

"North Korea and China have yet to officially confirm but looking at various circumstances, freight train operations between North Korea and China appear to have resumed today," ministry spokesperson Cho Joong-hoon told a briefing.

Train crossings had been on hold since April 29, when China suspended services with North Korea following consultations due to Covid-19 infections in its border city of Dandong. Shortly after, North Korea reported its first Covid outbreak, which it now says has ended.

The April suspension came less than four months after North Korea eased border lockdowns enforced early in 2020 against the coronavirus.

Global aid groups have blamed the border measures for North Korea's worsening economic woes and risks to food supplies for millions.

Last month leader Kim Jong Un declared victory over Covid and ordered the lifting of maximum anti-epidemic measures imposed in May, though adding that North Korea must maintain a "steel-strong anti-epidemic barrier".

Meanwhile, North Korea fired a ballistic missile on Sunday, Seoul's military said.

The launch is the latest in a record-breaking blitz of weapons tests by Pyongyang so far this year, including firing an Intercontinental Ballistic Missile at full range for the first time since 2017. (Reuters/AFP)