The two countries are at odds over overlapping claims for hydrocarbon resources in the region. A similar advisory, or Navtex, last month caused a row which was calmed after the intervention of German Chancellor Angela Merkel.
However, President Tayyip Erdogan said on Friday Turkey had resumed energy exploration work in the region as Greece had not kept its promises on the issue.
Seismic surveys are part of preparatory work for potential hydrocarbon exploration. Turkey and Greece are also at odds over issues such as overflights in the Aegean Sea and ethnically divided Cyprus.
(Additional Reporting by Michele Kambas; Writing by Daren Butler; Editing by Kim Coghill)
Categories: Europe, Europe and Australia, Greece, Turkey, Turks

Ah : dreams : If only Turkey and Greece could talk about sharing the riches of the Mediterranean in stead of fighting about it. (And Israel and Palestine and Lebanon …). Ah, dream on … Humans just like to fight.