The Ozero Cooperative, a dacha (country-house) network of Putin's inner circle.
The engine treats it as the origin point of the proxy-wealth system holding money on Putin's behalf.
Its members — the Kovalchuks, Timchenko, and the Rotenberg brothers — became the foundation of an architecture that, per the engine, distributed $200B+ through sham deals, forced oligarch donations, and offshore structures, including the $2B tied to cellist Roldugin in the Panama Papers.
It shows how a small circle of trusted friends can be turned into the human machinery for hiding a leader's fortune.