Biden still has his boot on the neck of the US oil industry which could bring down world oil prices and reduce the revenue Putin is getting.
Right now Saudi is at almost maximum production. They are simply buying oil at a steep discount from Russia and reselling it at great profit on the world market. A supertanker can hold 2 million barrels of oil. Russian oil is selling at about a 30 dollar discount. Saudi will make 60 million dollars less transportation costs. That is wise business.
It should be noted that oil comes in different grades which affects it price. The Russian oil from the Ural area is very high grade oil.
OIL IS FUNGIBLE. Someone please tell this to slow Joe Biden.
Biden killed a US pipeline on day one of his term.