Images published show pig bodies stacked in cramped sheds, partially burned, some with the roof destroyed.
"About 13,000 pigs died as a result of a Russian attack on an agricultural enterprise in the Novovodolazka community in the Kharkiv region", writes Ukraine's state emergency service in a press release.
The pigs were kept in eight barn buildings on over 13,000 square meters, all of which burned down in the fire, added the emergency service.