Greece and Turkey have begun another round of talks to settle their long-running dispute over maritime boundaries in the Eastern Mediterranean, Reuters reports. Tensions escalated sharply last year when Turkey began exploring for gas in waters claimed by Greece, and both sides declared overlapping exclusive economic zones, bringing the countries to the closest point of war in decades.

The hitch: Neither side can agree on what to discuss. Athens wants to only tackle the exclusive economic zones and the continental shelf in the Aegean and eastern Mediterranean, but Ankara wants to also set out the air space of the two states.

Iran has released footage of its underground “missile city” — a military base armed with cruise and ballistic weapons — amid growing tensions between Tehran and Washington.

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