The US has conducted a non-nuclear underground experiment to enhance its ability to detect low-yield nuclear explosions that it explicitly linked with a test that Washington suspects China carried out in 2020 – an accusation Beijing denies. The US Department of Energy announced on Wednesday that the National Nuclear Security Administration (NNSA) conducted a “subsurface, non-nuclear chemical high-explosive” experiment at the Nevada National Security Site, which it said aimed to “increase the...