The U.S. and South Korea held a tabletop exercise at the Pentagon on Wednesday that was scheduled to practice responses to a North Korean nuclear attack, days after the DPRK test-fired long-range missile and “tactical nuclear” rockets.

Pentagon deputy press secretary Sabrina Singh told reporters that the Deterrent Strategy Committee Tabletop Exercise (DSC TTX) was carried out as planned but said further details will be shared later. She added that North Korea’s missile launches “destabilize” the region.