Neighbours Greece and Turkey, NATO allies but historic foes, have long been at odds over issues including where their continental shelves start and end, energy resources, migration, flights over the Aegean Sea, and the ethnically partitioned island of Cyprus.

Greece and Turkey still disagree on the extent of issues needing to be tackled over the designation of their maritime boundaries but talks will continue on the subject, Greek Foreign Minister George Gerapetritis said after meeting Turkish counterpart Hakan Fidan in Athens.

President Tayyip Erdogan sought to reset Turkey's strained ties with the United States by inviting President-elect Donald Trump to visit, and said Trump spoke very positively about Turkey during a phone call.