Both Ukraine and Russia are on track to make around 1.5 million drones this year, mostly small "first-person view" vehicles that cost a few hundred dollars apiece and can be piloted remotely to identify and attack enemy targets.

The United States said on Monday it was Russia that is escalating the conflict in Ukraine by deploying North Korean troops, after the Kremlin warned that Washington would deepen its involvement in the war by allowing Kyiv's forces to strike far into Russia with U.

Russia is paying $2,000 a month for each North Korean soldier, per reports. But the soldiers, who could number 100,000, probably won't see any of it.