North Korea is expanding a weapons plant that manufactures missiles used by Russia against Ukraine, according to new research from a US-based think tank.

The Ukrainian military said on Monday that it found Western-made parts inside North Korean ballistic missiles, marking the latest discovery for Kyiv as it continues to find technology from Europe and the US inside weapons used by the Russian military.

Pyongyang's support has become crucial between the two countries, as Kim Jong Un assists Moscow in replenishing its stockpiles of weapons.​

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.