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.

A Ukrainian delegation led by the country's defence minister is in Seoul to ask for weapons to be used in the war, according to South Korean media. Meanwhile, Russian media reports suggest Moscow is still planning to deploy its Sarmat intercontinental ballistic missile on combat duty.

Researchers at SI Analytics, a South Korean satellite imagery firm that uses AI technology to scour images, also confirmed the new construction at the February 11 plant, saying in a report on Monday that some of the construction near the loading area would likely be used to conceal the future operations of the factory from satellites.