Both France and Vanuatu claim the two uninhabited islands whose ownership has been the subject of negotiations between the two countries' governments.
Last week, Vanuatu summoned French diplomats after reports that the French navy had visited the island in January and painted a French flag on a rock.
Ten years ago, an FLNKS leader Victor Tutugoro signed a document with the Vanuatu Prime Minister Edward Natapei stating that the islands belonged to Vanuatu.
