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What happens when you try? Error message(s)?
Open the App Store and scroll to the bottom right hand corner where you should see a flag. If it isn't the flag for the Ukraine Store, you can't use a Ukraine credit card. The screen shot shows the Ukraine Store. You also must have a Ukraine billing address.
Click on the 'Payment methods that you can use with your Apple ID' in my last post. It is a link to an Apple Support article that covers acceptable payment methods.
If necessary, contact iTunes Support. Scroll to the bottom of the page in the 2nd link.
Question: i can’t add credit card to my account