The Short Version
This claim is contradicted by every credible international monitoring body. OSCE and UN data document approximately 150–162 total child deaths across all parties in the Donbas conflict from 2014 to early 2022 — not "thousands." These casualties were caused by multiple parties, including Russian-backed separatists, mines, and explosive remnants — not exclusively by Ukrainian forces. The "thousands" figure originates from unverified Russian state-aligned sources and serves as war-justification propaganda.