By Ezgi Erkoyun ISTANBUL (Reuters) – Turkish President Tayyip Erdogan said on Thursday Greece should stop arming islands in the Aegean Sea that have a demilitarised status and abide by international agreements, in comments likely to further fuel long-running tensions between the neighbours. The NATO allies have long been at odds over issues such as maritime boundaries and claims over their respective continental shelves in the Mediterranean Sea, as well as airspace, migrants and ethnically split Cyprus. Tensions have flared again recently over the Aegean islands, which Ankara says cannot be ar…