Pentagon officials are sending America’s newest strike fighter to South Korea, where they will participate in war games and strengthen the U.S. military’s capabilities at a time of historic tensions with North Korea. This is the first time we have operated the F-35B in the Republic of Korea, Pentagon spokesman Navy Capt. Jeff Davis told reporters Monday. That announcement came just as North Korea is pursuing an aggressive schedule of nuclear weapons program tests. The regime reportedly tested a ballistic missile engine on Friday, including technology that could possibly be used in an eventual intercontinental ballistic missile, according to CNN. State-run media, meanwhile, has issued a series of bulletins threatening preemptive strikes on U.S. forces in the region.