North Korean ballistic missiles fired at Ukraine by Russian forces since late December have been far more precise than salvos of the weapons launched over the past year, two senior Ukrainian sources told Reuters.

When Ukrainian soldiers captured two North Korean prisoners of war last month, it provided the first undeniable proof of Pyongyang’s direct involvement in the war against Ukraine

Experts say Pyongyang’s advancing missile technology raises global security risks and threatens regional stability.

Ukraine’s military intelligence chief denied recent media reports that North Korean troops deployed to Russia have temporarily retreated from the front lines, in an interview published on Wednesday.

North Korean troops, largely special ops forces, have suffered high casualties in bloody assaults not unlike other units, including prison units.