https://cdnph.upi.com/ph/st/th/1681784282887/2026/i/17842832189592/v1.5/N-Korea-warns-of-chain-of-countermeasures-over-US-led-RIMPAC-exercise.jpg" /> North Korea denounced Friday an ongoing U.S.-led multinational military exercise taking place in Hawaii, calling it a "war rehearsal" that will trigger a "chain of countermeasures."