Israel and Greece have invoked their new, secret mutual defense pact to counter heavy Turkish sea and air movements in the eastern Mediterranean.DEBKAfile discloses that Israel may gain the new advantage of a military presence at Greek bases following a long phone conversation Wednesday night Sept. 14 between the Israeli and Greek prime ministers. They also agreed to share intelligence. Israel's expanded cabinet of eight was called into session over the Turkish threat to its off-shore oil and gas rigs.