Hm... The AH64 is from 1979 technically speaking... It's not a game changer, technically speaking, now it doesn't mean it can't be used to escalate the situation to an entire new level putting both washington and moscow in a very uncomfortable situation, some sort of prelude to a do or die moment for instance, it would be unfortunate to see ukrainian hardliners deciding to go all in and attack within russia with those planes in order to escalate the conflict to an entire new level of military engagement, since peace and negotiations aren't the priority for the ukrainian leadership obviously, it's not even an option to them it seems, so it naturally begs the question "where are they going with that?" it leaves only one way out... Not sure how much control the US has over the F-16s btw