Lebanese and Syrian spokesmen gave warning this week that frustration on that front could quickly lead to cross-border attacks, and Israel said its retaliation to any provocation would be huge.

ECONOMIST: Middle East peacemaking reawakens

Turkey has been taking cross-border military action, including airstrikes and artillery shelling, against the PKK in retaliation to attacks by the group on targets in Turkey from bases in the Kurdish region of northern Iraq.

CNN: Turkey launches major Iraq incursion