Tankers stranded in the Persian Gulf during the US-Iran conflict have sat idle long enough for warm-water barnacles, algae and marine growth to colonize their hulls, a phenomenon known as biofouling. This is now forcing costly dry-dock cleaning, slowing vessel speeds, raising fuel burn and pushing up war-risk insurance premiums — a knock-on cost of the conflict that has received far less attention than headline oil prices.

An Underreported Consequence of the Standoff

Most coverage of the US-Iran conflict has focused on oil prices and the risk of a full closure of the Strait of Hormuz, through which roughly a fifth of the world’s seaborne crude normally passes. Less visible is a slower-moving, equally costly problem: ships that have been anchored or rerouted for weeks are now dealing with heavy hull fouling. Specialist “bottom cleaner” crews are being dispatched to scrape off marine growth that has attached itself to tankers stranded in the warm waters of the Persian Gulf, according to reporting on the scale of the buildup facing vessels caught in the standoff (CNN Business).

Biofouling is not a cosmetic issue. A fouled hull increases drag, which raises fuel consumption by as much as 20–40% depending on severity, according to maritime engineering estimates cited across shipping-industry literature. For an industry already absorbing higher war-risk premiums, the added fuel and dry-docking costs compound an already expensive standoff.

Where the Standoff Stands Now

By early July, daily oil flows through the Strait had recovered to more than 10 million barrels a day, with Saudi and UAE crude exports running at roughly 90% of pre-war levels, according to a review of shipping data by UK Finance. That recovery has helped push Brent crude down roughly 40% from its April peak. But the fact that flows are recovering doesn’t erase the weeks of disruption already priced into contracts, insurance renewals and vessel maintenance schedules.

Bank of England Governor Andrew Bailey has flagged this lag effect directly, noting that even as spot oil prices fall, “the higher energy prices of the past four months mean there’s already some inflationary pressure in the pipeline” for consumer economies (Hanbury Wealth Economic Review).

Why This Matters Beyond Shipping

The biofouling problem is a useful proxy for a broader truth about the Hormuz conflict: its costs are not confined to the headline price of a barrel of oil. They show up in:

• Insurance markets — War-risk premiums for Gulf transits have risen sharply and are only slowly normalizing as underwriters reassess vessel-specific risk.
• Fuel and emissions costs — Fouled hulls burn more bunker fuel, an expense that ultimately filters into freight rates and consumer goods prices.
• Dry-dock capacity — A surge in demand for emergency hull cleaning is straining specialist marine services capacity in Gulf ports.
• Second-round inflation — Central banks in energy-importing economies, including the UK, have explicitly built these lagged supply-chain effects into their inflation forecasts for the second half of 2026 (Bank of England, June 2026 Monetary Policy Summary).

The Bigger Picture for Trade-Dependent Economies

Economies with heavy exposure to Gulf shipping lanes — the UK, Singapore, and the broader Gulf states themselves — are watching this unwind carefully. Singapore’s own trade ministry has explicitly cited the conflict as a downside risk to its 2026 growth forecast even as second-quarter GDP beat expectations (CNBC). Dubai, meanwhile, has continued to post resilient non-oil growth, insulated somewhat by economic diversification away from hydrocarbons (Gulf Business).

For freight forwarders, insurers and importers, the lesson of the biofouling episode is that Gulf conflict risk doesn’t disappear the moment a ceasefire is announced — it lingers in maintenance backlogs, insurance renewal cycles and fuel cost pass-through for months afterward.

Key Takeaways

• Prolonged vessel idling in the Persian Gulf has created a costly biofouling problem now requiring emergency hull-cleaning operations.
• Oil flows through Hormuz have largely recovered, but the inflationary “pipeline effect” of the disruption is still working through import-dependent economies.
• Central banks, including the Bank of England, have explicitly incorporated lagged energy-shock effects into their 2026 inflation forecasts.
• Trade hubs like Singapore and Dubai are tracking the conflict’s tail risks even as headline growth figures remain strong.

As the United States and its G7 partners race to build critical minerals supply chains outside China’s control, ASEAN economies — sitting on some of the world’s largest reserves of nickel, tin and rare earth-adjacent minerals — are increasingly practicing a strategy of deliberate hedging: courting Western investment in processing and manufacturing capacity while avoiding formal alignment against China, their largest trading partner and dominant regional investor.

Why This Has Become Urgent

China’s near-total dominance of global rare earth processing — controlling roughly 90% of capacity, according to industry analysis — has turned critical minerals into one of the sharpest instruments of economic statecraft in the current cycle (see our companion coverage). Beijing’s escalating export controls on yttrium, scandium and other elements essential to AI chip manufacturing have made clear to Washington and its allies that dependence on a single-country supply chain for these inputs is a structural vulnerability, not a temporary inconvenience.

Researchers at the Center for Strategic and International Studies have warned explicitly that the pattern of escalating export controls between the US and China risks triggering “an export control and economic statecraft arms race that could severely undermine global security and economic prosperity” (Cryptopolitan).

Where ASEAN Fits

Southeast Asia holds a genuinely pivotal position in this contest, but its individual economies are responding in structurally different ways:

• Indonesia has leaned into resource nationalism, banning raw nickel ore exports to force domestic processing investment — a strategy that has driven record foreign investment but risks entrenching a narrow, commodity-dependent industrial base if it fails to move into higher-value battery manufacturing (see our companion coverage).
• Malaysia has instead captured the manufacturing layer of the battery and electronics supply chain, positioning itself as ASEAN’s leading battery exporter while AMRO credits “robust electronics exports and AI-related investment” for cushioning growth against broader “geoeconomic fracturing” (see our companion coverage).
• Singapore continues to function as the region’s financial and logistics anchor, benefiting from rerouted shipping traffic during the Hormuz conflict while its manufacturing sector rides the same AI-driven semiconductor supercycle reshaping demand for the critical minerals underlying chip production (see our companion coverage).

The Regional Coordination Angle

Rather than each country negotiating individually with Washington or Beijing, ASEAN members have been building horizontal coordination mechanisms. Indonesia and the Philippines have proposed a nickel supply chain corridor explicitly framed around regional integration, with the Philippine Chamber of Commerce and Industry’s president describing the goal as ensuring “ASEAN is strongest when it acts as one unit” (Tribune.net.ph). Separately, Malaysia’s Selangor state has deepened bilateral cooperation with Indonesia’s West Java Province across manufacturing, infrastructure and Islamic finance, reflecting a broader pattern of intra-ASEAN economic deepening running in parallel with — rather than as a substitute for — engagement with both Washington and Beijing (ACN Newswire via Barchart).

Why Neither Superpower Can Simply Bypass ASEAN

For Washington, ASEAN’s mineral reserves and manufacturing capacity represent one of the few credible near-term paths to diversifying critical minerals and electronics supply chains away from China — a strategic priority underscored by the UAE’s own recent upgrade in US technology export access (see our companion coverage), part of a broader pattern of Washington deepening ties with trusted partners outside China’s orbit. For Beijing, ASEAN remains both an enormous export market and, increasingly, a manufacturing base for goods designed to route around US tariffs and export restrictions — making continued economic engagement equally indispensable.

This dual dependency is precisely what gives ASEAN economies room to hedge rather than choose. It also means the region’s trade and investment data over the next several years will likely be read closely by policymakers in Washington, Beijing, Brussels and Tokyo as a real-time indicator of how the broader US-China economic rivalry is actually being resolved on the ground, rather than in policy statements.

Key Takeaways

• China’s dominance of rare earth processing has made critical minerals a central front in US-China economic rivalry, with ASEAN’s mineral reserves newly strategically significant.
• Indonesia, Malaysia and Singapore are pursuing distinct national strategies — resource nationalism, manufacturing capture, and financial/logistics hubbing, respectively — rather than a unified regional approach.
• ASEAN nations are building horizontal coordination mechanisms, like the proposed Indonesia-Philippines nickel corridor, to strengthen collective bargaining power.
• Both the US and China have deep enough economic stakes in ASEAN that the region can credibly hedge between them rather than being forced to align with either bloc.

Indonesia’s economy just posted its best quarterly performance since 2023, but the central bank’s response to that strength tells a more cautious story than the headline number suggests — one with direct implications for anyone tracking capital flows into Southeast Asia’s largest economy.

The Growth Number

Indonesia’s economy expanded by 5.61 percent in the first quarter of 2026, its fastest pace in more than three years, according to McKinsey’s Southeast Asia quarterly review, boosted by a surge in government spending and strong household consumption tied to the Eid festive period. The Asian Development Bank’s July outlook has since nudged its own 2026 forecast for Indonesia higher by half a percentage point to 3 percent for the year, while separately projecting Indonesia’s growth to hold stable at 5.2 percent in both 2026 and 2027 in its base scenario — reflecting how much forecasts vary depending on the specific window and methodology used.

Why Bank Indonesia Is Playing It Safe

Despite the strong print, Bank Indonesia has kept its benchmark policy rate unchanged at 4.75 percent for a seventh consecutive meeting, prioritising rupiah stability over further easing in the face of external volatility. The central bank has explicitly signalled readiness to step up both onshore and offshore foreign exchange intervention to defend the currency and keep inflation within its 2026–2027 target range — a notably defensive posture for an economy growing at its fastest pace in years.

That caution is paying off on the capital-flow side. Foreign direct investment into Indonesia grew for a second consecutive quarter, rising 8.1 percent to 249.9 trillion rupiah, or roughly $14.5 billion, in the first quarter of 2026.

How fast is Indonesia’s economy growing in 2026?

Indonesia’s GDP grew 5.61% in Q1 2026, its fastest pace in more than three years, driven by government spending and Eid-season consumption, while Bank Indonesia held its policy rate at 4.75% to protect the rupiah amid regional currency volatility.

The Singapore Connection

Much of that capital has a specific source: Singapore. Indonesia’s Coordinating Minister for Economic Affairs, Airlangga Hartarto, confirmed that Singapore’s investment in Indonesia reached approximately $17.4 billion in 2025, calling the city-state “a reliable partner,” with investment into the Batam-Bintan-Karimun corridor specifically reaching $5.7 billion in 2025, up from the prior year. The two governments are now expanding cooperation into the digital economy and green energy, alongside a Young Farmer Development Program launched in June 2026 aimed at deepening agricultural technology ties.

The Regional Context

Indonesia’s performance sits within a broader Southeast Asian picture that is, in McKinsey’s own framing, showing “signs of softening” even as growth foundations remain broadly stable, with higher costs, currency volatility and weaker external demand weighing on households and businesses across the region. Cushman & Wakefield’s Southeast Asia Outlook similarly frames the region as expanding 4.8 percent in 2025 before slowing to a projected 4.3 percent in 2026, citing resilient domestic consumption and moderating interest rates as the main supports.

The ADB’s own assessment is blunter about the source of the regional drag: the Strait of Hormuz-linked Middle East conflict is weighing more heavily on developing Asia than previously anticipated, with higher energy costs, supply disruptions and tighter financial conditions expected to dampen growth in the months ahead even as inflation broadens and stays elevated for longer than earlier forecast.

What It Means for Investors

Indonesia’s combination of strong headline growth, disciplined currency management, and deepening Singapore-anchored capital inflows makes it one of the more structurally sound growth stories in Southeast Asia heading into the second half of 2026 — provided Bank Indonesia’s defensive rate stance succeeds in insulating the rupiah from the broader regional energy-price shock now working through the system.