Commentary: ‘Below the threshold of war’ is where Singapore’s new navy patrol vessels operate

What makes the new Offshore Patrol Vessels (OPVs) useful is how they offer room for calibrated responses at a time when threats at sea are less conventional, says Collin Koh from the S Rajaratnam School of International Studies.

The Republic of Singapore Navy's new Sentinel-class offshore patrol vessel launched in Berne, Germany on Oct 1, 2026. (Photo: MINDEF)

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SINGAPORE: Not every threat at sea calls for a warship. Many maritime security challenges today require more than routine law enforcement but less than a conventional military response.

It is in this space that Singapore’s new offshore patrol vessels (OPVs) are intended to operate. On Friday (Oct 2), the Republic of Singapore Navy (RSN) launched the first of its four OPVs which will join the Maritime Security and Response Flotilla to “enable more calibrated responses”.

The OPVs, acquired from Germany’s Fassmer, will be delivered to the navy progressively from 2028 to replace the existing, smaller Sentinel-class maritime security and response vessels (MSRVs).

Two peculiar features stand out of this new class of OPVs: The vessels do not sport the usual grey livery of navy vessels; instead, they are painted white. They will also not use the RSS (Republic of Singapore Ship) prefix usually assigned to commissioned vessels. These suggest that Singapore does not intend for the OPVs to be operated like regular Navy warships.

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THE NEED FOR MORE OPTIONS AT SEA

The challenge comes as threats at sea become more complex. Incidents, such as maritime coercion and threats to critical underwater infrastructure, can have strategic consequences yet fall short of an armed attack and may not necessarily require a militarised response.

This is especially when incidents involve civilian or commercial vessels. For example in October 2023, a Baltic Sea gas pipeline and subsea telecommunications cables between Finland and Estonia were severed. A container ship, the NewNew Polar Bear, allegedly dragged its anchor across the seafloor. Even then, the distinction between an accident and intentional sabotage is hard to prove.

This is where optics also matter as part of the message. A heavily-armed “grey hull” warship facing down a civilian vessel – lightly armed or even unarmed – would be overkill and could send a signal of escalation if the countries involved face existing maritime tensions.

This helps explain why there has been a “white hull” proliferation across Asia, referring to vessels typically associated with coastguards and maritime law enforcement.

Despite its rapid navy buildup, China has continued to pour immense resources into bulking up its coastguard, which spearheads its maritime sovereignty and rights assertion in contentious waters such as the South China Sea. The Philippines has likewise been expanding and modernising its coastguard.

In theory, white hulls could project a less militaristic impression, especially when deployed to politically sensitive areas.

In practice however, this “grey versus white” distinction has become blurred. Navies perform important peacetime roles. Some coastguards undertake roles traditionally associated with navies and are part of the defence establishments such as in India and Vietnam, or are integral parts of navies, such as in Norway and Colombia.

WHAT MORE CALIBRATED MEANS

What makes Singapore’s new OPVs an interesting addition to the fleet is the combination of the force they can bring to bear, where they can operate and the signal their deployment sends.

During his speech at the Committee of Supply Debate in February 2026, Singapore Defence Minister Chan Chun Sing said that the Singapore Armed Forces (SAF) must possess not just “robust conventional capabilities” but also “other calibrated options in response to an expanded range of scenarios beyond and below the threshold of war”.

The OPVs are equipped with both lethal and non-lethal capabilities and make available a broader set of capabilities to the fleet, such as unmanned systems, that the RSN can flexibly employ across a spectrum of low to high-intensity missions.

The OPVs are substantially larger than the vessels they will replace: They measure about 95 metres-long and displace close to 2700 tonnes, compared to the current MSRVs at 55m and 500 tonnes. This gives them longer operating range, at-sea endurance and space to flexibly accommodate a variety of payload modules depending on the mission.

This also helps explain why the OPVs sit within the RSN rather than the Police Coast Guard (PCG), whose mandate is confined to Singapore’s territorial waters. The RSN can operate beyond that – which allows for flexibility to address threats farther afield or for maritime security cooperation activities with regional partners.

Like many regional countries seeking to promote stability at sea, Singapore’s new OPVs reflect this continued emphasis on projecting a less militaristic impression: a platform that is operated by the navy yet operating under the threshold of armed conflict.

Taken together, these features give more room for calibration.

DOING MORE WITH A SMALL NAVY

Many navies worldwide, especially small ones like the RSN face a practical challenge: An increasingly complex maritime security environment requires us to do more with finite resources.

The perennial issue of manpower concerns has long dogged the SAF, which puts emphasis on multi-role platforms that require less crew yet flexible enough to adapt to different mission requirements.

The OPVs fit that logic. Singapore’s approach is instructive in how small navies seek to draw a tight balance between an expanding mission scope and capacity constraints in the context of evolving maritime security challenges.

Collin Koh is Senior Fellow at the Institute of Defence & Strategic Studies, a constituent of the S Rajaratnam School of International Studies, based at Nanyang Technological University, Singapore.

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S Rajaratnam国际研究院的Collin Koh表示，新型近海巡逻舰(OPV)的优势在于，在海上威胁日益多样化的当下，它们能够提供精准应对的空间。

新加坡共和国海军新型“哨兵”级近海巡逻舰于2026年10月1日在德国伯尔尼下水。（图片：新加坡国防部）

这段音频由人工智能工具生成。

新加坡：并非所有海上威胁都需要动用军舰。如今，许多海上安全挑战需要的不仅仅是常规的执法行动，也不需要传统的军事应对。

新加坡新型近海巡逻舰（OPV）正是计划在此区域执行任务。10月2日（星期五），新加坡共和国海军（RSN）下水了四艘近海巡逻舰中的第一艘，这些巡逻舰将加入海上安全与应急舰队，以“实现更加精准的应急响应”。

从德国法斯默公司采购的近海巡逻舰（OPV）将从 2028 年开始逐步交付给海军，以取代现有的较小的哨兵级海上安全和响应舰（MSRV）。

这种新型近海巡逻舰有两个显著特点：首先，它们没有采用海军舰艇常见的灰色涂装，而是通体白色；其次，它们也不会使用通常用于现役舰艇的“新加坡共和国舰艇”（RSS）前缀。这些特点表明，新加坡并不打算让这些近海巡逻舰像正规海军舰艇那样运作。

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海上出行需要更多选择

随着海上威胁日益复杂化，挑战也随之而来。诸如海上胁迫和对关键水下基础设施的威胁等事件，虽然可能造成战略后果，但其严重程度不及武装攻击，因此未必需要采取军事应对措施。

尤其当事故涉及民用或商用船舶时，情况更是如此。例如，2023年10月，芬兰和爱沙尼亚之间的波罗的海天然气管道和海底通信电缆遭到破坏。据称，一艘名为“新新北极熊”号的集装箱船拖着锚在海底作业。即便如此，区分事故和蓄意破坏也很难证实。

在此，形象塑造也至关重要。一艘装备精良的“灰色船体”军舰与一艘轻型武装甚至未武装的民用船只对峙，显然是过度杀伤，如果相关国家之间存在现存的海上紧张局势，则可能发出局势升级的信号。

这有助于解释为什么亚洲各地出现了“白色船体”船只，这些船只通常与海岸警卫队和海上执法部门有关。

尽管中国海军建设迅速，但仍持续投入巨资加强其海警力量，以维护其在南海等争议水域的海洋主权和权利。菲律宾也同样在扩建和现代化其海警力量。

理论上，白色船体可以给人一种不那么军事化的印象，尤其是在部署到政治敏感地区时。

然而，在实践中，这种“灰色与白色”的界限已经变得模糊不清。海军在和平时期发挥着重要的作用。一些海岸警卫队承担着传统上由海军负责的职责，它们是国防机构的一部分，例如印度和越南；或者它们是海军不可分割的一部分，例如挪威和哥伦比亚。

更精确的校准意味着什么

新加坡新型近海巡逻舰之所以成为舰队中引人注目的新成员，是因为它们能够发挥强大的作用，能够在特定区域作战，并且它们的部署所传递出的信号。

新加坡国防部长陈振声在2026年2月举行的财政预算案辩论中表示，新加坡武装部队不仅必须拥有“强大的常规能力”，还必须拥有“其他经过调整的选项，以应对战争门槛内外的各种情况”。

近海巡逻舰配备了致命和非致命能力，并为舰队提供了更广泛的能力，例如无人系统，新加坡海军可以灵活地将其用于各种低强度到高强度的任务。

这些近海巡逻舰比它们将要取代的舰艇大得多：它们长约95米，排水量接近2700吨，而目前的海上支援船长55米，排水量500吨。这使得它们拥有更远的航程、更长的海上续航能力，以及更大的空间，可以根据任务需要灵活地搭载各种有效载荷模块。

这也解释了为什么近海巡逻舰隶属于新加坡海军（RSN）而非警察海岸卫队（PCG），因为警察海岸卫队的职责范围仅限于新加坡领海。新加坡海军的行动范围更广，这使其能够灵活应对更远海域的威胁，或与区域伙伴开展海上安全合作活动。

与许多寻求促进海上稳定的地区国家一样，新加坡的新型近海巡逻舰体现了这种持续强调展现不那么军事化的形象的理念：这是一个由海军操作的平台，但在武装冲突的门槛下运作。

综合来看，这些特性为校准提供了更大的空间。

小兵多干

世界各地的许多海军，特别是像新加坡海军这样的小型海军，面临着一个实际的挑战：日益复杂的海上安全环境要求我们用有限的资源做更多的事情。

人力问题一直是困扰新加坡武装部队的长期难题，因此新加坡武装部队更加重视多用途平台，这些平台需要的人员较少，但又足够灵活，可以适应不同的任务需求。

近海巡逻舰符合这一逻辑。新加坡的做法颇具启发性，它展现了小型海军如何在不断扩大的任务范围和能力限制之间寻求平衡，以应对不断变化的海上安全挑战。

科林·科赫是新加坡南洋理工大学拉惹勒南国际研究院下属国防与战略研究所的高级研究员。

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