Amid numerous global security challenges in 2026, Australia faces growing strategic concerns over China’s expanding influence and military activities in the South China Sea, a key maritime region that handles about two-thirds of the country’s trade and serves as a potential platform for projecting power toward Australia.

China asserts claims over approximately 90% of the South China Sea, a position rejected by a 2016 ruling from an international arbitral tribunal under the United Nations Convention on the Law of the Sea, which found no legal basis for China’s historic rights claims. Despite this, China has steadily reinforced its control in the area through military and coast guard presence, artificial island construction, and assertive maritime operations.

Three significant developments have marked China’s recent behavior in the region. Beijing has resumed large-scale land reclamation at Antelope Reef, expanded coast guard and maritime militia patrols—including the deployment of ostensibly civilian fishing vessels to advance territorial claims—and, for the first time, utilized its coast guard east of Taiwan to interrogate commercial ships regarding their origins and destinations, asserting jurisdiction beyond internationally recognized territorial waters.

These actions have heightened regional tensions, with incidents in July near Scarborough Shoal and Second Thomas Shoal involving aggressive maneuvers by Chinese coast guard vessels and maritime militia against Philippine sailors. In mid-2026, Chinese coast guard ship-days around Scarborough Shoal reached levels equal to the entire previous year, while maritime militia presence hit record daily averages in 2025.

Australia has expressed concern over these developments, particularly given China’s use of heavily militarized artificial islands in the Spratly archipelago, which extend Beijing’s power projection capabilities further south in the Pacific. Although distance has historically offered Australia some strategic protection, advancements in long-range missile technology—including tests of ballistic missiles launched from submarines into the Pacific—have diminished this advantage.

In response, the Australian government has sought to address the situation through diplomatic and defense measures. Foreign Minister Penny Wong publicly condemned China’s aggressive actions during ASEAN foreign ministers meetings, highlighting their destabilizing effects on regional security. Australia has also enhanced support for the Philippine Coast Guard by providing unmanned aerial and underwater vehicles and maintained a consistent naval presence in the South China Sea. However, Australia’s limited naval assets constrain its ability to sustain such deployments effectively.

Analysts note that while global crises—from Middle Eastern conflicts to geopolitical shifts in places like Venezuela and Greenland—demand attention, the evolving strategic environment in the South China Sea and North-East Asia presents an immediate and direct challenge to Australia’s security interests. Observers argue that the Australian government must communicate more clearly to the public about the implications of these regional changes, especially amid ongoing debates on defense capabilities, including nuclear-powered submarines and broader national resilience.

With China’s maritime coercion intensifying and the international focus diverted by other crises, Australian officials and strategists emphasize the need to prioritize awareness and preparedness in the waters directly to the nation’s north.