Take a look at the third episode of the documentary series The Petersburgers, aired on TV Rain (an independent Russian TV channel).
Among other things, it describes the notoriously murky and opaque scheme for transporting gas from Turkmenistan through Ukraine via pipelines owned by Gazprom.
Everyone always understood that this was a massive corruption scheme. Some obscure offshore company, ETG, was receiving billions while doing nothing.
This company was linked to the Ukrainian “businessman” (more accurately, a crook) Firtash. But it turns out it was the St. Petersburg gangsters connected to Putin.
Here is a separate description of this specific episode of the film.
They have devoured the whole country. That is why we cannot stay home on May 5 and must join the rally to reclaim our right to be citizens — we have to show that there are people in Russia who do not consider all of this normal.