A court in Sardinia has issued an order to seal a luxury villa in one of most prestigious tourist areas Porto Cervo, owned by Russian billionaire Roman Abramovich, local media said on Thursday.The L\'Unione Sarda newspaper said a court order was attached to the gates of the Cala di Volpe villa, saying that the building was sealed off due to an ongoing probe into possible construction violations.\"The order was signed by judge Marco Contu on a request from prosecutor Elisa Calligaris,\" L\'Unione Sarda said.The height of the building allegedly does not comply with national and local construction standards.