SEOUL: North Korea abruptly withdrew its staff from an inter-Korean liaison office in the North on Friday, Seoul officials said. The development will likely put a damper on ties between the Koreas and complicate global diplomacy on the North’s nuclear weapons program. Last month, the second US-North Korea summit in Vietnam collapsed due to disputes over US-led sanctions on the North. Seoul’s Unification Ministry said that North Korea informed South Korea of its decision during a meeting at the liaison office at the North Korean border town of Kaesong on Friday. The North said it “is pulling out with instructions from the superior authority,” according to a Unification Ministry statement. It didn’t say whether North Korea’s withdrawal of staff would be temporary or permanent. According to the South Korean statement, the North added that it “will not mind the South remaining in the office” and that it would notify the South about practical matters later. Seoul’s Vice Unification Minister Chun Hae-sung told reporters that South Korea plans to continue to staff the Kaesong liaison office normally and that it expects the North will continue to allow the South Koreans to commute to the office. He said Seoul plans to staff the office with 25 people on Saturday and Sunday. The South Korean statement calls the North’s decision “regrettable.” It said South Korea urges the North to return its staff to the liaison office soon. The liaison office opened last September as part of a flurry of reconciliation steps. It is the first such Korean office since the peninsula was split into a US-backed, capitalistic South and a Soviet-supported, socialist North in 1945. The Koreas had previously used telephone and fax-like communication channels that were often shut down in times of high tension. The town is where the Korea’s now-stalled jointly run factory complex was located. It combined South Korean initiatives, capital and technology with North Korea’s cheap labor. Both Koreas want the US to allow sanctions exemptions to allow the reopening of the factory park, which provided the North with much-needed foreign currency.