Isn't the Y-8F600 the one that was assisted not only by Ukraine, but by Pratt & Whitney? I believe they are the ones that also have alot of Western standard avionics and electronics, right? Y-9 is going to be a Y-8 upgrade, and Y-8 is the one copied from the Russian AN-21, correct? Just wondering. I'm just trying to follow along and not get these aircraft confused.