Ukrainian Interior Minister Arsen Avakov announced the arrest on social media.
Ukrainian authorities say they have arrested a teacher accused of trying to sell a 13-year-old girl for $10,000.
Interior Minister Arsen Avakov reported the case on Facebook on November 22, with photos of the girl and 52-year-old teacher.
The girl was living at a boarding school in the eastern Kharkiv region for orphans and children from broken homes.
Ukrainian media named the suspect as Galina Kovalenko, a teacher of Ukrainian and Russian languages.
Avakov said the buyer hinted that the girl's organs would be removed, paying the teacher 1,000 hryvnia ($39) for photos of her and her medical records.
"They got this seller 'red-handed' when she took the girl out of the boarding school, brought her to the buyers, and received money," the minister said.
Comment: Israel is the organ harvesting and human trafficking global ringleader, with complicit help from US and Turkey