Greece and Cyprus pushed for a tougher European Union response to Turkey's natural gas exploration in the contested Mediterranean waters at an EU summit today. <br />''<br />''This came after Ankara restarted operations of a survey ship it withdrew last month.<br />''<br />''Two weeks after their last summit where leaders discussed economic sanctions, the EU has so far failed to persuade Ankara to stop exploring in waters disputed by Greece and Cyprus.<br />''<span style="color: #222222;"><br />''France and Germany said earlier this week that Turkey must revise its stance and stop the explorations in the contested waters.</span><br />