North Korean ballistic missiles fired at Ukraine by Russian forces have become far more precise over time, according to senior Ukrainian military officials.Vladimir Putin's invading forces have been using imported North Korean projectiles since the end of 2023,

More than 20 missiles fired by Russian forces since December are now hitting within 160 to 330 feet of their targets, marking a significant improvement.

North Korean soldiers fighting for Russia are reported to have suffered significant losses.Though the troops are believed to be elite forces, they've been used similarly to Russian prison units.The soldiers appear to have been removed from combat.