By Alasdair Pal and Mohamed Junayd MALE (Reuters) – A day after coal and fertilizer billionaire Andrey Melnichenko was placed on the European Union’s sanctions list on March 9, his superyacht Motor Yacht A stopped broadcasting its location while in Maldives’ waters, maritime data shows. In Italy, four days later, authorities seized another of Melnichenko’s vessels – the world’s largest sailing yacht, estimated by Italian financial police to be worth $578 million. Switching off devices that allow authorities to track a ship’s whereabouts can help keep yachts out of their sight. But in Maldives,…