It was one of the last still providing Ukrainian citizenship for newborns in the southern city of Kherson which was then under Russian occupation.
Early in the occupation, Ukrainian parents faced pressure to accept Russian citizenship for their newborns.
"When we asked for diapers, the Russians told us, 'If you come without Russian birth certificates, we will not give you diapers'," said Natalia Lukina, 42.
The ministry did not respond to a request for comment on the situation in Kherson during Russian occupation.
It is unclear how many babies received Russian citizenship, because Russian officials recorded them and Ukrainian registration workers did not cooperate with them, Klimenko said.