Turkey’s defence ministry said on Thursday that Ankara has issued a maritime notice pushing Greece to coordinate with Ankara on all research activities in parts of the Aegean Sea that Turkey sees as its continental shelf. Turkey recently issued a Navtex – a legal advisory message to mariners – outlining objections to Greece’s activities in the Aegean Sea that Ankara says violate international law and demanding it coordinate these. In a first, Ankara issued the notice without an expiration date. Earlier this month, Greece’s foreign minister said its government had plans to extend its territorial waters further, including potentially in the Aegean Sea. Greece says the only issue it is prepared to discuss with Turkey is the demarcation of their maritime zones, including continental shelves and exclusive economic zones.