E-3 would never enter the Ukraine airspace (and they are not Ukraine, but totally-we-are-not-the-part-of-that NATO), while A-50/100 would be gladly shot down if the chance arises. So 'essentially' is not the right word here.

Why does it matter? A-x would never need to enter Ukrainian airspace anyway.

Physics says what they should if they need to support something in the Western parts.

They can scan almost all of Western Ukraine from Belarus airspace. The southern most coast south of Moldova, and maybe Odessa is beyond it's published estimated range assuming it flies more than 100km inside Belarus airspace, but not by much.

>scan almost

At what altitude? Earth isn't flat, so even at 20km and superb electronics you don't see what happens near the ground.

Though probably someone already published their routes, but I too lazy to check, honestly. Still my point stands - As can be downed (and everyone would clap, especially in the US) while Es "NO YOU DONT THATS ARTICLE 5"

>At what altitude? Earth isn't flat, so even at 20km and superb electronics you don't see what happens near the ground.

Over distances of 600km the vertical offset due to earth's curvature is about 20km. If it flies at it's operational ceiling of 14km, it can offset most of that but wouldn't have direct line of sight on planes at extreme range flying below 6km. If it has over the horizon capability though, which honestly seems highly likely for a recently updated system, then it should be able to compensate for the remaining shadow with some loss of resolution. Which I'm guessing is why it's estimated range is considered 600km. I'm sure the military analysts making those estimates know about these effects.

Anyway, southern Ukraine can be directly radar imaged from over Crimea so it's really not an issue.