What do we know, and what do we not know, about what happened?
Russia's defence ministry said Ukraine struck with six U.S.-made HIMARS rockets.
The ministry acknowledged the attack only in the final paragraph of a 528-word daily roundup, more than 36 hours after the attack took place.
Grey Zone, a Telegram channel linked to the Wagner mercenary outfit, said that around 500 men were billeted in the complex.
You see, they turned on their phones and got spotted," wrote Grey Zone, a Telegram channel linked to the Wagner Group mercenary outfit.