[Blennos]

Here is the answer, from the article:

Saudi Arabia is able to sell the oil it used to use for electricity generation on the world oil market and reap much higher prices than it pays to Russia

Buy low, sell high. No mystery here.

[mewzilla]

It also means Russian sanctions are a joke.

[Migraine]

Also no mystery: we buy estra oil from Saudi, which is actually Russian oil, w/o appearing to buy the taboo Russian oil. “Shell” game.