>>52459
>the fact that this happened over Ukrainian held territory would imply that the SU-57 is actually undetectable by the Ukrainians.
Either tech is lacking, or the air defense has more holes than Swiss cheese.
>why would they fly the Su-57 alongside a test vehicle over Ukrainian territory?
In theory a "drone strike force" consists of one Su-57 and 2-3 S-70. The pilot in the Su-57 controls the drones. They add more firepower to one pilot, more rockets and bombs, but also they help the Su-57 remain stealthy: stealth aircrafts typically hold their armament inside the fuselage to lower radar cross section. But if they want to fire them they have to open up - which breaks their silhouette and they open up to radars too. If the weaponry is another airplane, they they don't have to reveal themselves, and/or can do it when it's absolutely necessary. The S-70 is more sacrificable than the Su-57 with pilot.
The real question is why the Su-57 shot the S-70 down??? Surely not by mistake, especially if they flew together as a wing.

>But maybe this will help the west develop means to detect the S-70.
You might be right.