North Korea tests missile that it claims can target U.S. mainland

North Korean leader Kim Jong Un recently observed a test of an upgraded solid-fuel engine for missiles that could potentially reach the U.S. mainland, according to state media. This development is part of North Korea’s strategy to enhance its military capabilities with more agile and hard-to-detect weapons. Solid-fuel missiles are advantageous because they are easier to move and launch compared to liquid-fuel missiles. The Korean Central News Agency reported that the engine’s thrust has increased to 2,500 kilonewtons from a previous 1,970 kilonewtons. However, some experts believe North Korea might be exaggerating its progress, as key details like the engine’s combustion time were not disclosed. The test is part of a five-year plan to upgrade North Korea’s strategic strike capabilities, which include nuclear-capable ballistic missiles. There is speculation that North Korea’s missile program might be facing delays or is being developed with possible Russian assistance. QUESTION: How might the development of more advanced missile technology in North Korea impact global security and international relations?