A buying cartel will also fail because they need the oil to keep their economies running more than Russia needs electronic numbers on a computer.T
This means Western sanctions against Russia oil failed, so now they are forming a buying cartel to force Russia to sell its oil at better than friendship price to EU. This price cap has to be cheaper or at least the same as that of selling to China and India so that EU can not be taken advantage of by OPEC, China and India.