Holding a British & Ukrainian Passport

Our situation is this;

Im British and my wife is Ukrainian, we live in the UK and have 2 children. Our eldest is almost 17 and was born in Ukraine and feels very attached to the country. She holds a British passport but now wants to get a Ukrainian one also.

We have almost no relatives left in Ukraine because of illness and the war. We do have a private and commercial building, which I want to pass to my children to be organised and later sold. My children want to be able to do this independently of their parents, who are either elderly/in poor health or not interested to help.

Can they get the Ukrainian passport, keeping the British one and how to go about it?

I know Ukraine doesn't officially recognise duel citizenship but UK does.

Im looking for the way to make this happen.