Following the Oct. 12 bombing on the Indonesian resort island of Bali blamed on the Jemaah Islamiyah regional terror network, much of the region is on edge.
"We are preparing for the worst," said Indonesian national police spokesman Zainuri Lubis.
Two-thirds of the countrys 270,000 police officers are to be patrolling churches, shopping malls and other public places in Jakarta and around the worlds largest Muslim nation.
Papua, one of the only predominantly Christian provinces where separatists are fighting Indonesian rule, is to host President Megawati Sukarnoputri for a Christmas Day celebration.
Security guards, not ruddy-cheeked Santa Clauses, will greet shoppers at malls in the predominantly Roman Catholic Philippines in efforts to thwart fresh bomb attacks such as those that killed more than 20 people since October in the capital Manila and in the south.
A traditional Christmas ceasefire with the communist New Peoples Army has been called, but rather than extending for the typical two weeks it will cover only Dec. 24-25 and Dec. 31-Jan. 1.