Hello evince,
My guess it is because it is not so easy to shut down oil operations as it is to shut down a McDonald's retail restaurant. It involves laying off a bunch of people. Once that is done it is not so easy to just crank back up again. Once you lay them off, they go get jobs elsewhere and are no longer available when you are ready to crank back up again.
And the whole operation is probably financed with investor money. Those payments can't just stop because the politics demands. If the oil is not flowing, and the money is not coming in, then missing the payments could put Koch into default. Money would have to get pulled out of something else. Being the big tycoon, it is unlikely the amount of money required to make the investor payments is simply laying around in a checking account. So then, what other operation should get shut down to satisfy the oil business investors? And who are those investors? Is it 401K money from American workers? That has to remain secure.
Just guessing, but it could be pretty complicated.
It would only seem logical that there is also a lot of physical equipment involved. Expensive equipment. Who owns it? If Koch wants to pull out of Russia, how does that equipment get removed? It has to be torn down and dismantled from whatever application it is attached to, then it has to be broken down into shippable size pieces. It has to be loaded onto a ship and sailed across an ocean. Who is going to do that work if Russia does not cooperate? Who paid for the physical equipment? Are their investors involved with that? And on and on.
I'm sure the structure of these deals is complicated.
It's easy to hate. It's more difficult to understand.