https://web.archive.org/web/20240507081637/https://21stcenturywire.com/2024/05/02/the-roots-of-u-s-corruption-in-ukraine-interview-with-andriy-derkach/

We cannot consider the political situation in Ukraine in isolation from the ‘external management’ by the US deep state, the Democratic Party, and the business that Poroshenko built together with the Democratic Party on the territory of Ukraine. It is no secret that after the coup (actually it was an unconstitutional voting mechanism) the United States, namely (Victoria) Nuland, appointed Poroshenko as President of Ukraine. Next, the spheres of influence were divided. You know that Biden started to be in charge of Ukraine together with Nuland, and what happened next is called privatization of positions, and privatization of management. What is that? Poroshenko placed in charge of the National Bank of Ukraine Gontareva his partner in the financial business. He also started to control the credit and financial resources. Nuland put her friend Jaresko as finance minister and began to control financial flows and the aid allocated to Ukraine by the international community and the United States. It turned out to be a symbiosis of politics and business (influence peddling and excessive earnings). And, what is important here, the spheres of influence were divided. Joe Biden got Naftogaz, and (Amos) Hochstein, his favorite advisor, became chairman of the supervisory board – with a crazy salary. I don’t think any state-level manager in the United States received the kind of salary that Hochstein and his appointees on the Naftogaz supervisory board received for implementing a corrupt “reverse gas” scheme, funneling Russian gas back into Ukraine from Europe, bringing in an additional 500 million euros a year in extra profit.

That's why the US is so deep in Ukraine. They are making money off of this whole corruption.