In a bold move the Italian government declared publicly to enforce it's claim on the whole Mediterranean Sea because of profound historical reason. All ships and all planes passing the territory of Italy have to get prior permission from Rome when passing through the Mediterranean Sea. It is the "core interest" of the people of Italy. Anyone who who will not submit to these rules will face war with Italy.
All "relevant" countries have to obey "relevant" international rules and regulations. Claims of other countries to the Mediterranean Sea are not "relevant".