The Paris MOU is based on the principle that the prime responsibility for compliance with the requirements laid down in the international maritime conventions lies with the ship-owner/operator. Responsibility for ensuring compliance remains with the flag State. It aims to eliminate the operation of sub-standard ships through a harmonized system of port State control. The members are Belgium, Bulgaria, Canada, Croatia, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Latvia, Lithuania, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Russia, Slovenia, Spain, Sweden, and the UK.