Exactly one year ago, Russian troops and armored tanks rumbled into Ukraine. But the war did not go exactly as planned. Ukraine was expected to topple quickly under one of the world's mightiest militaries. It did not.

Today, Ukraine is in a stalemate with Russia. Armed with advanced weaponry from the West and the sheer force of will of its people, Ukraine remains proudly independent. AI Business takes a look at the advanced -- and deadly -- drones used in this war.