The Ministry of Foreign Affairs said that the exported children were transported into Russian territory, in a chilling warning about what might happen to them.
Ukraine says Russia is violating international humanitarian laws with such operations and called for other countries’ support.
The horrific allegations come after a foreign policy expert has told Express.co.uk that Putin could be preparing to establish concentration camps in the country.
Nile Gardiner said that the world could see the return of “concentration camps, inflicting horrific, horrendous suffering on the Ukrainian people”.
The Ministry of Foreign Affairs of Ukraine said: “The forcible transfer of civilians to the territory of the aggressor state, including children, shows signs of abduction.