The EU is considering a full maritime services ban on Russian oil. While the final proposal and decision are still pending, the measure would replace the current oil price-cap regime by prohibiting European and allied companies from providing maritime services for Russian oil exports, regardless of the sale price. The ban would cover transportation, insurance, financing, and other related services. This brief outlines how such a full services ban could be designed and implemented effectively, and how to address potential negative side effects and potential Russian countermeasures.