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 U.S.-based think tank have concluded, based on satellite images.

Russia has supplied North Korea with more than 1 million barrels of oil since March, as a payment for weapons and troops sent to the war against Ukraine. According to an analysis of satellite imagery in a report published by a British-based nonprofit that uses high-tech to make data publicly available,

North Korea is advancing its nuclear capabilities, raising security concerns for South Korea amidst discussions of U.S.-North Korea dialogue.