'Do not fall into trap of tit-for-tat sectarianism'
We focus on the deterioration in Saudi-Iran ties following Riyadh's execution of a Shia cleric on Saturday. The world's press leads on fears of heightened tension between the two superpowers in the Middle East. We look at the Iranian, Saudi, Lebanese and British coverage. Elsewhere, we take in the Wall Street Journal's predictions for 2016, which include the return of bookstores and the fall of the Islamic State organisation.