China appears to be testing a stealthy new trimaran at sea, according to a photograph circulating on social media, in what could be a further effort to develop unconventional naval platforms. The image first emerged on Weibo on Sunday and appears to show a vessel featuring an inverted wave-piercing bow, three-hull design and angular superstructure surfaces that could be intended to reduce its radar signature. The vessel, which is fitted with a prominent antenna mast and multiple dome-shaped...