* ISIL seeks to establish Islamic caliphate across Iraq, Syria * Nasrallah praises Iraqi call for volunteers against ISIL BEIRUT, June 17 (Reuters) - Leba**n's Hezbollah militia chief said his fighters' intervention in Syria had kept an al Qaeda splinter group that has seized territory in Iraq from spreading west into Leba**n, a newspaper reported on Tuesday. Hezbollah, a Shi'ite Muslim group, has provided significant help to Syrian President Bashar al-Assad in retaking some territory from Sunni rebels bent on ousting him.