Ban "remains gravely concerned" about the situation on the Korean peninsula, his spokesman Stephane Dujarric said yesterday.
North Korea yesterday fired a pair of short-range missiles and announced the liquidation of all remaining South Korean assets on its territory.
The UN chief "once again" calls on North Korea "to return to full compliance with relevant UN resolutions and to cease destabilising acts such as today's launch of two missiles," he added.
North Korea is barred from developing ballistic missile or nuclear programs under UN resolutions.