WASHINGTON: North Korea is expanding a key weapons manufacturing complex that assembles a type of short-range missile used by Russia in Ukraine, researchers at a US-based think tank have concluded, based on satellite images. The facility, known as the February 11 plant, is part of the Ryongsong Machine Complex in Hamhung, North Korea's second-largest city, on the country's east coast. Sam Lair, a research associate at the James Martin Center for Nonproliferation Studies (CNS), located at the