The right of the Claimant, a citizen of Ukraine, to apply to the Ukrainian court with a claim for the deprivation of parental rights of the parent who is a citizen of a foreign state depends on the presence of the last permanent place of residence on the territory of Ukraine, therefore the Claimant should collect the necessary evidence that will confirm the fact, that the Defendant has a permanent place of residence in Ukraine. Answers from relevant government bodies can serve as such evidence, although it is not always possible to obtain them.
If the foreigner had a permanent place of residence on the territory of Ukraine, which will be known to the Claimant, but at the time of filing a lawsuit with the court, there will be no information on whether such a place of residence has been preserved for the defendant - a foreigner, then you can try to apply to the Ukrainian court in accordance with the rules of Part 1 Art. 27 and part 9, 10 of Art. 28 of the Civil Procedure Code of Ukraine, i.e. at the last known registered place of residence of the defendant in Ukraine, but at the same time, it will be necessary to provide evidence that will confirm that the defendant was indeed registered at the address specified in the claim for deprivation of parental rights.
Deprivation of parental rights of foreign parents remains an impossible dream for many Ukrainian mothers who independently raise children from foreign parents who, due to various reasons, were not in Ukraine or did not register their place of residence here, who, not maintaining ties with their family, do not report their place of residence, hiding behind the veil of personal data protection.