Entering Ukraine as a Ukrainian born, naturalised British citizen

Question

I left Ukraine when I was 8, moved to the UK in 2005.

I was born in Ukraine but permanently reside in the UK, have British Citizenship and a British Passport.

Will I have any problems with going back to Ukraine? I have never had a Ukrainian passport. My mum is convinced there will be problems at the border because Ukraine does not recognise dual citizenship. She is worried that I will not be able to leave Ukraine on my return journey back to the UK. Especially because I am 22, male and have not registered on anything in Ukraine, including military service (as I do not live there). I don’t think I have officially declared that I am a permanent resident in the UK either - but I’m not sure if I have to do that?

Has anyone ever had any problems with traveling there and back? Especially my age. What should I expect?

Edit:

1. I gained British Citizenship a few months ago, when I was 21 (before my birthday).
2. I do not have a Ukrainian passport at all.
3. I had a child travel document but that expired in 2008.
4. My birth certificate is Ukrainian.
5. Both of my birth parents are Ukrainian and held Ukrainian citizenship when I was born.
6. My British Passport lists my birthplace as a Ukrainian city.

Answer 1

I am an Ukrainian citizen.

I didn't have such an experience nor people I know had but I can refer to the legal document.

The Law of Ukraine "On Citizenship of Ukraine" regulates your question.

There is an article 2(стаття 2) in this law, which constitutes that in Ukraine there is no such thing as multiple citizenship, you must not and cannot have a citizenship in order to acquire Ukrainian one.

In article 19(стаття 19), it is said that effectively you are losing Ukrainian citizenship the moment you acquire a citizenship of other country if it is done voluntary and you are an adult(your age is above 18). Thus you, effectively, was a Ukrainian citizen by birthplace(cause you have a birth certificate) until you have accepted the British citizenship. Another sidenote, it wouldn't be considered voluntary if you didn't receive a document that justifies that.

Even if you had Ukrainian citizenship, it would have been much much tougher to enter EU from UK with Ukrainian citizenship than Ukraine itself and back. Ukraine ain't some African country, if you are Ukrainian in Ukraine you can leave the country if you have required documents for leaving to some country(e.g visa to UK) as all civilized countries do.

That said, you are just another British citizen which enters Ukraine. Given you didn't commit any crimes in Ukraine which remained unanswered AND you have a valid type of visa of your choice with all required prerequisites and conditions met - you should be absolutely fine.