The oil market is very delicately balanced. Russian exports are closer to 10million barrels per day. Those are near irreplacable in the market.

Production is tightly controlled by the Opec cartel, and even they do not have that much spare capacity. It is possibly around the 2 million mark right now.

So, you really cannot stop the Russian oil at all. If you do, you will increase the price of oil way beyond 100 per barrel and no one knows what kind of side effects it will immediately create.