North Korea sent 11,000 elite soldiers to support Russia. Their progress — especially in drone warfare — has implications not only for Russia's war on Ukraine but also peace on the Korean Peninsula.

Families in Ukrainian cities are taking refuge from massive swarms of Russian drones, as Moscow steps up its airborne assault with attacks designed to undermine Ukrainian morale.

Drones are “ubiquitous, because they are quite useful, and they're demonstrating that every day in Ukraine,” one analyst told NBC News.