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 United States has information that North Korea is preparing additional supplies of ballistic missiles to Russia, as well as long-range self-propelled artillery and multiple launch rocket systems (MLRS).

North Korean leader Kim Jong-un has visited the facility several times and the state media has previously talked about the tactile missiles being mass-produced at the location.