It’s also possible the US and UK gave targeting information or helped Ukraine with site selection. It’s not like we don’t know where this stuff is coming from.
UK? Quite possibly. Given their recent admission (finally) around the Russian propaganda for Brexit
UK has no infra to target even their own missiles. They always had to use US!
I mean, sure, maybe some random person at the Pentagon could have done it but the US has not acted as a Ukraine ally for years now.