Guterres had met President Nicos Anastasiades and President of the Turkish Republic of Northern Cyprus Mustafa Akinci in the German capital for "informal, trilateral" talks of reviving long-stalled peace negotiations.
The EU's sanctions coupled with the international community's endorsement of Greek Cypriot unilateralism dims the hopes for 'gas-for-peace'.
Turkish President Recep Tayyip Erdogan says no project excluding Turkey or Turkish Republic of Northern Cyprus can be realised in the Eastern Mediterranean.
Turkish Defence Minister Hulusi Akar made clear that Turkey will not sit and watch without doing anything, while others drill for oil and gas.
Turkey's Energy Minister Fatih Donmez says the ship, Yavuz, began operations in an area off the Karpas peninsula where TRNC foreign minister says the meeting between Turkish and Greek Cypriot leaders does not bring much hope to solve the issues.
"Cooperate with us and win," says Turkey's Foreign Minister Mevlut Cavusoglu calling on "those interested in the Eastern Mediterranean."
Instead of taking on the role of fair mediator, Brussels has broken its own rules to accept the Republic of Cyprus into the EU and is now inflaming tensions with Turkey over natural resources.
Four major parties in Turkey's Parliament issue a declaration condemning EU's decision to suspend high-level talks with Ankara over the country's drilling activities in the eastern Mediterranean.
Foreign Minister Mevlut Cavusoglu says a fourth ship will be sent to the eastern Mediterranean "as soon as possible," as EU unveils measures against Turkish hydrocarbon exploration.
Turkish Cypriot President Mustafa Akinci proposed to the internationally recognised Greek Cypriot government that they cooperate in the search for gas off the divided island.
Ankara and the EU are at loggerheads over who has the right to explore newly-discovered gas fields.
The Turkish government is standing firm on its oil and gas exploration in the Eastern Mediterranean as Greece and Greek-administered Cyprus call on the European Union to take action against Turkey.
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