The answer depends on where they live, and on Ukrainian law rather than Irish law. If one or both of them resides in the Ukraine, then probably they can apply for a divorce there. If they both live in Ireland, they may have to apply here, If the divorce is ordered in compliance with Ukranian law, then it will be recognised here. Whether it is possible under their particular circumstances (where they reside) is a question for a Ukranian lawyer.
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