For more than 10 days, Iran has unleashed one weapon in particular at countries that host U.S. troops.

Shahed drones have targeted American bases killing U.S. troops and hitting civilian infrastructure and energy facilities.

But long before they flew across the Middle East, Shah heads fired by Russia targeted Ukrainian troops and infrastructure.

We have two looks at the drone threat,

starting with special correspondent Jack Hewson, one of the few foreign correspondents who reported

from Harkiv at the beginning of the full-scale invasion. Jack returns to that eastern Ukrainian city

to meet frontline troops who have more experience facing Shah Head drones than anyone else.

Harkiv's air war doesn't begin in the city. It starts out here in the fields and villages

that lie between the front line and the regional capital.

We're on our way to a position about 20 kilometers from the Russian line in Yuzhou, in

Harkiv province. And strangely, even though we're a long way from Harkiv, the city itself,

this is where air defense actually begins.

Shaheds fly over this area in the direction of the city, and it's here that they're intercepted.

And it's also where they intercept Russian observation drones as well.

Notice the nets. That's to protect cars like ours.

Making this journey more harrowing is the fact that short-range first-person view or FPV drones

have hit vehicles here.

They have an expanded range and are now guided by fiber optic cable to evade electronic jamming. Everything which is closest to 40 kilometers could be destroyed by Russian drones,

by different types of drones, not only PV drones, but lancet and a lot of other types of Russian drones.

Drone and missile strikes, many launch from deep inside Russia have hit Harkiv,

Ukraine's most bombarded city, for years.

And it's only getting worse.

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