CNA explains: Threat of a global arm race over hypersonic missiles

South Korea said Pyongyang's latest launch of a ballistic missile had likely exploded in midair. The missile flew towards the east coast of the Korean Peninsula, minutes after it was detected, it appeared to have splashed down into the sea. Japan's military says the short flight time indicates that the weapon may have been a short-range missile. CNA's Tan Qiuyi explains how these weapons differ from conventional ones, and how they could potentially upend the world's balance of power.