I've dated two, plus a Serb lady. The first Ukrainian was a gold-digger. Very attractive, ultra feminine, had excellent girl-game. It was old RVF days and I was lucky to read that she was just monkey-branching from one good deal to the next better deal. I ran into her recently and she is still looking for another trade up. Dodged an expensive bullet on that one.
The Serbian woman was an excellent lady, willing to commit to me, low/manageable hypergamy behavior. Closer age gap than the first woman. She was a good catch that I let go, maybe too easily. Again, very feminine. Literally said "I will cook healthy meals for us and keep a clean house always, if that is what you want." I believe she was sincere.
The second Ukrainian is, I believe, a keeper. Very feminine, traditional, and much lower hypergamy tendency. The age gap between us is closer than on either other woman. She's really a catch; practicing Orthodox, proud of appearance but not excessive, thrifty, considerate, and has reasonable expectations.
Younger FOB women are high threat/high reward. They know their advantages over US women, and how to play them. You must control your emotions and see your relation for what it is, not what you want it to be. Do not idealize/pedestalize them, but appreciate the good they bring and be willing to understand some of them are ice cold exploiters.
Generally speaking, age gap isn't as big a deal with these women. They don't mind dating someone 15+ years older. Instead, YOU better understand that the bigger the age gap, the more likely this relation is about resource extraction. Don't be a 45 year old 6, dating a 27 year old 8 and think you have upper hand. You likely don't. The age gap:wealth ratio is meaningful. The "score" gap is also meaningful.
My EO church has a surprising number of single women in the 30-50 range. Old guys will warn you about crypto-bimbos reforming themselves overnight, but it should be worth considering.