He first graphic here proves you wrong

Look at the six categories in the graph. Only the dark red represents processed petroleum.

Why would anyone sell cheap crude then buy back expensive gas??

Right, why would any country export cheap raw materials and buy back expensive finished products? That could never happen, right? Surely the majority of the world's countries aren't doing it?

Why have refiners if youre exportibg crude?

Bunch of reasons: (1) for domestic use, (2) they can sell it for more, and (3) Russia had a great industrial sector back when it was part of the USSR, and some of that still survives.

But you are right that attacks on Russian refineries will reduce the processing that is happening within Russia. They will have to buy more products from China, etc. Hopefully this convinces their government to invest in industry, but based on what I've seen so far I'm not holding my breath on this.