Russia’s system for deporting children from Ukraine began to work back in 2014, acvording to Ksenia Hell, an employee of the office of the prosecutor of the International Criminal Court in The Hague. Since February 2022 this system has intensified as children are taken deep into the territory of the aggressor country without the possibility of returning or finding relatives.
Textbook example from https://en.wikipedia.org/wiki/Genocide_Convention
„…forcibly transferring children out of the group…“