Denys Zaporozhchenko (R) and his ten-year-old son react after the bus delivering him and and more than a dozen other children back from Russian-held territory arrived in Kyiv on March 22, 2023. - More than 16,000 Ukrainian children have been deported to Russia since the February 24, 2022 invasion, according to Kyiv, with many allegedly placed in institutions and foster homes. (Photo by Sergei CHUZAVKOV / AFP)

Denys Zaporozhchenko (R) looks at his ten-year-old son after the bus delivering him and and more than a dozen other children back from Russian-held territory arrived in Kyiv on March 22, 2023. - More than 16,000 Ukrainian children have been deported to Russia since the February 24, 2022 invasion, according to Kyiv, with many allegedly placed in institutions and foster homes. (Photo by SERGEI CHUZAVKOV / AFP)

Denys Zaporozhchenko (L) meets his children Nikita, Yana and Dayana (R) fter the bus delivering them and more than a dozen other children back from Russian-held territory arrived in Kyiv on March 22, 2023. - More than 16,000 Ukrainian children have been deported to Russia since the February 24, 2022 invasion, according to Kyiv, with many allegedly placed in institutions and foster homes. (Photo by SERGEI CHUZAVKOV / AFP)

Inessa (R) meets her son Vitaly after the bus delivering him and more than a dozen other children back from Russian-held territory arrived in Kyiv on March 22, 2023. - More than 16,000 Ukrainian children have been deported to Russia since the February 24, 2022 invasion, according to Kyiv, with many allegedly placed in institutions and foster homes. (Photo by SERGEI CHUZAVKOV / AFP)

Inessa hugs her son Vitaly after the bus delivering him and more than a dozen other children back from Russian-held territory arrived in Kyiv on March 22, 2023. - More than 16,000 Ukrainian children have been deported to Russia since the February 24, 2022 invasion, according to Kyiv, with many allegedly placed in institutions and foster homes. (Photo by SERGEI CHUZAVKOV / AFP)

Inessa meets her son Vitaly after the bus delivering him and more than a dozen other children back from Russian-held territory arrived in Kyiv on March 22, 2023. - More than 16,000 Ukrainian children have been deported to Russia since the February 24, 2022 invasion, according to Kyiv, with many allegedly placed in institutions and foster homes. (Photo by SERGEI CHUZAVKOV / AFP)