evidence: Recent actions revealed Jakarta's heightened commitment to safeguarding its boundary as Beijing expands its footprint in the area. [...] "This is almost certainly aimed at protecting Indonesia's sovereign rights in the vicinity of the Natunas from encroachments by China, though of course Jakarta would never name and shame China publicly," said Ian Storey, senior fellow at Singapore-based think tank ISEAS-Yusof Ishak Institute. [...] "Indonesia also has maritime boundary disputes with other ASEAN countries, such as Vietnam. In the Celebes Sea, Indonesia still has an unresolved dispute with Malaysia over the Ambalat hydrocarbon block — the scene of several naval standoffs in 2002 and 2009."