Putin is already in direct violation of article 353 of the Russian Criminal Code:

"Article 353. Planning, Preparing, Initiating, or Waging War of Aggression

1. Planning, preparing, or initiating a war of aggression - is punishable by deprivation of liberty for a term of seven to fifteen years.

2. Waging a war of aggression - is punishable by deprivation of liberty for a term of ten to twenty years."

Admitting you are wrong and made mistakes is sort of an impossible task for despot dictators though. He has spent decades killing or jailing anyone who told him something he didn't like, so everyone learned to tell him good news.

It's part of the reason why the initial invasion went so terribly; Putin's analysts told him Kyiv would bend over immediately, and that the public would welcome them as liberators.

Putin smells so much of his own farts that he bought it completely. The analysts were then shocked when Putin said "Okay, invasion today"