By Hyunsu Yim SEOUL (Reuters) – North Korea on Sunday tested a new solid-fuel hypersonic missile with intermediate range, state news agency KCNA said on Monday, in a move that was condemned by the United States, South Korea and Japan. The launch was aimed at testing the reliability of new multi-stage, high-thrust solid-fuel engines and an intermediate-range hypersonic maneuverable controlled warhead, according to KCNA, which said the test did not pose a security threat to neighbouring countries. South Korea’s military in a statement criticized the launch as a violation of U.N. Security Council…