South Korea warned North Korea against further provocations, after Kim Jong Un’s regime pledged to dismantle the last remnants of President Moon Jae-in’s legacy of rapprochement and move troops into disarmed border areas.

Moon’s office urged North Korea to tread carefully after the country reduced to rubble a $15 million liaison office set up north of the border in 2018 as a symbol of reconciliation. Earlier Wednesday, North Korean state media unleashed a fresh stream of threats and insults against South Korea and Moon, including a personal rebuke from Kim’s sister, Kim Yo Jong.

Kim appears to have sacrificed the projects to demonstrate his frustration with the South Korean leader’s continued support for a U.S.-led sanctions campaign that has battered the country’s economy and deprived it of foreign currency. North Korea is raising the pressure on Moon after an unprecedented series of short-range ballistic missile launches failed to draw President Donald Trump back to the negotiating table.