Australian Naval Institute

By Karl Gading Sayudha* 

15 February 2025

Source: https://navalinstitute.com.au/indonesia-needs-better-sea-and-air-defence/

Indian Brahmos missiles on their launcher trucks: Indian Ministry of Defence.

Indonesia isn’t doing enough in acquiring advanced naval and air systems. Too much money and focus are still being spent on the army, the traditionally dominant service—yet the country hardly faces a risk of a ground war. (The Australian Strategic Policy Institute. The Strategist.)

The greater concern would be a threat from China, which can only come by sea and air. This is seen in Beijing’s increasing provocations against its neighbours, particularly Taiwan and the Philippines.

Indonesia’s main military shortcomings are its lack of airborne-early-warning, land-based anti-ship and surface-to-air capabilities. Establishing or strengthening them would mean reallocating funds from the army.

The risk of military escalation between Indonesia and China cannot be taken lightly despite their close diplomatic and economic relations. One of the main reasons for taking it seriously is that China already has ongoing territorial disputes in the South China Sea with some other members of the Association of Southeast Asian Nations, particularly Vietnam, the Philippines and Malaysia.

While Jakarta is not a claimant in the territorial disputes, Chinese incursions into Indonesia’s exclusive economic zone have become increasingly frequent. In October and November 2024 alone, the China Coast Guard made multiple infringements in the North Natuna Sea, off Borneo, prompting Indonesia’s Maritime Security Agency to dispatch vessels in response.

Yet, the head of the agency, Vice Admiral Irvansyah, has highlighted the stark inadequacy of Indonesia’s maritime patrol capabilities. With only 10 ships distributed across three operational areas, the agency falls far short of its ideal fleet of 90 ships needed to patrol Indonesian waters effectively. This inadequacy reflects the broader imbalance in Indonesia’s defence priorities.

Jakarta continues to favour the modernisation of the army, while the navy and air force fall behind.

Of the approved 155 trillion rupiah ($15.1 billion) for the 2025 defence budget, 54 trillion rupiah ($5.3 billion) is allocated to the army, while the navy and air force receive just 20 trillion ($1.9 billion) rupiah and 18 trillion rupiah ($1.8 billion), respectively.

As an archipelagic nation, Indonesia’s security depends on a strong navy to protect its vast waters and a capable air force to secure its skies.

History has shown the importance of maritime power, as demonstrated by the might of the Srivijaya and Majapahit empires, which both originated from Indonesia. Today, Indonesia must adopt a similarly maritime-focused strategy, supported by modern technology.

Airborne early warning aircraft, coastal-defence batteries and air-defence missile systems are particularly needed for monitoring and deterring potential threats.

Indonesia has only a weak ability to see what is going on in its own airspace. Foreign aircraft or even cruise missiles may fly into that airspace without the armed forces knowing, or if they are discovered the Indonesian response could be far too late. 

A group of airborne early warning aircraft would go a long way towards remedying the problem. Options are the SAAB GlobalEye and Boeing E-7.

Lack of a coastal-defence missile batteries leaves Indonesia vulnerable to maritime incursions. The government has made progress in modernising the navy through the procurement of Scorpene submarines, FREMM frigates and indigenous patrol vessels. 

But these efforts must be complemented by anti-ship missile systems on shore, which would be easy to hide and hard for an enemy to deal with.

Options include the BrahMos missile developed and manufactured by Russia and India, the US Harpoon, the French Exocet, the Turkish Atmaca and even the Chinese YJ-12E. Media last year reported plans to buy YJ-12Es, but Jakarta should carefully consider geopolitical implications of such a deal and whether weapons that China offers for export would be as effective as competitors’.

Indonesia has also shown interest in acquire the BrahMos missiles. This would make Indonesia the second ASEAN country to acquire such technology after the Philippines. The deal would include versions for launch from ships and the shore.

Buying BrahMos missiles would help diversify Indonesia’s sources of weapons and make it less vulnerable to arms embargoes or other interruptions of supply. The French and Turkish missiles would still be good alternatives, however.

Such weapons might be operated by the army, but the navy is the service that has expressed interest in acquiring them.

Finally, Indonesia’s spending on modern air-defence systems must also be expanded. While the acquisition of Turkish Hisar batteries, firing anti-aircraft missiles of short to medium range, is a step in the right direction, more systems are needed to cover key strategic areas. 

Only with a robust air-defence network can Jakarta counter potential sorties and incursions by adversaries.

Since the Ministry of Defence allocated the NASAMs surface-to-air batteries to the air force, that service would be the likely operator of any air-defence systems of medium or long range from future acquisitions.

Indonesia’s defence strategy must evolve to reflect changing geopolitical circumstances. As a maritime nation, its security depends on a strong navy and air force equipped with modern technology. It needs to reallocate defence spending before it is too late.

* Karl Gading Sayudha is an analyst at the public affairs and strategic communication firm Kiroyan Partners.