Hers a simple google search for you. Many sources.
https://www.google.com/search?q=ukraine+children+kidnapped&oe=UTF-8&hl=en-gb#ip=1
the Wikipedia link, yourself having linked Wikipedia earlier
https://en.wikipedia.org/wiki/Child_abductions_in_the_Russo-Ukrainian_war
With the United Nations stating this is a war crime
https://www.bbc.co.uk/news/world-europe-64985009
Tangential to this, I quite enjoy this young man’s recount of the conflict https://youtu.be/jlTnKYTxWOY
But I bet this is all “right wing propaganda” somehow.