I've been following the development of hypersonic rockets for a while and Russia definitely has them and has tested them. If Russia is currently using them then odds are Ukraine is getting missile defense assistance from the US on da low (US isn't going to blatantly say what they're doing). Russia of course has them and if they're using them it's a sign that they're trying to dodge a very advanced missile defense system or flex but that later option is very stupid if that's the case.