The Indo-Pacific’s New Fault Line: Supply Chains, Not Sea Lanes, Are Drawing the Lines

The late 2010s and early 2020s witnessed a marked intensification of U.S.–China trade tensions, with the imposition and subsequent recalibration of tariffs as the most visible, yet ultimately superficial, manifestation of a deeper, more intractable rivalry. As Chan et al. (2025) observe, high-level diplomatic engagements have produced only fleeting moments of de-escalation, with the underlying architecture of trade restrictions remaining poised for rapid reactivation. Since then, competition has expanded beyond tariffs to include export controls, investment screening, and strategic use of resources. Critical minerals like rare earths and lithium have become important policy tools. The 2025 U.S. National Security Strategy (NSS) highlights economic security, viewing heavy reliance on foreign sources for key components as a weakness and making supply chain resilience a strategic priority. This article contends that the 2025 NSS elevates economic security into national security, accelerating a shift in the Indo-Pacific from open-market globalization toward supply-chain blocs, and that the most rigid boundaries form at midstream chokepoints where processing and conversion capacity determine what is actually available.

The New Terrain: Availability and Chokepoints

When it comes to critical minerals, availability means reliable access to the specific materials, with the required quality, delivered on time and at reasonable cost, all within manageable regulations. Simply having mineral resources does not guarantee supply (Shiquan & Deyi, 2022). The value chain starts with mining raw materials, followed by refining and separation to reach the needed purity. After that, processing and conversion create intermediates, which are then made into final products. Disruptions can occur at any stage, so having ample raw material does not help if it cannot be refined or processed for large-scale production (IEA, 2025, pp. 8–9).

Mining is necessary for supply, but it is rarely the primary source of insecurity. The main challenge is converting ore into usable inputs, constrained by capital, technology, permits, and regulations, especially at midstream stages, where licensing, standards, and export controls affect operations. Such capacity offers strategic leverage, as seen with rare earths: in 2024, China mined roughly 60% of global rare earths but handled about 91% of separation and refining (IEA, 2025, pp. 8–9, 174-175). Diversifying mining alone, without expanding midstream capacity, will not significantly change supply dynamics.

From Policy Tools to Bloc Boundaries

The formation of supply-chain blocs proceeds along three mutually reinforcing channels. First, incentives reallocate investment and sourcing by changing the expected returns and risks of producing inside a trusted network. The NSS links economics to national security, prioritizing “reindustrialization” and “re-shoring” by attracting investment into domestic capacity (The White House, 2025, p. 13). It also supports tariffs and measures to boost industrial production and lessen reliance on adversaries for critical components (The White House, 2025, p. 14). As a result, firms increasingly cluster production where policy, market access, and compliance conditions are more predictable.

Second, controls harden boundaries by raising the legal and operational friction of sourcing outside the network. For critical minerals, this typically occurs through licensing scrutiny, end-use checks, and shipment delays, which increase uncertainty even when trade continues. Sino–Japanese friction illustrates the mechanism: Japanese industry sources noted stricter checks on shipments to Japan and signs that some exporters had stopped handling specific shipments (Takenaka, 2026). Recent trade data also underscore the imperative of risk management, as China’s rare-earth magnet exports to Japan fell in December 2025 compared with the previous months (Reuters, 2026). The core effect is to reduce the bankability of supply by raising planning and financing risks.

Third, conditional alignment lowers friction within the network by tying preferential access to interoperable rules on screening and export-control compliance. The NSS indicates that the United States is prepared to offer “more favorable treatment on commercial matters, technology sharing, and defense procurement” to partners that assume greater regional responsibility and align export controls with U.S. approaches (The White House, 2025, p. 12). Over time, these arrangements consolidate blocs by reducing internal transaction costs and increasing external frictions.

The Implications of the Indo-Pacific Region

The effects of supply-chain boundary formation in this area are anything but uniform. Japan, situated at the high-value end of manufacturing, finds its vulnerabilities concentrated in midstream inputs required by sectors such as semiconductors and robotics. The recent China–Japan tension shows how quickly availability can turn conditional: stricter screening of Japan-bound rare-earth imports and a decline in China’s magnet exports to Japan in December 2025 increased transaction risks (JapanToday, 2026; Reuters, 2026). Japan has responded by diversifying its supply, using long-term non-China sources with Lynas and Japanese trading houses developing domestic options, including a government-backed trial to recover rare-earth-rich seabed mud near Minamitori Island in early 2026 as a feasibility step toward potential pilot-scale operations (Obayashi, 2026; Sojitz Corporation, 2025).

Australia is increasingly positioned not just as an upstream supplier, but as a partner in a U.S.-aligned mining-to-processing” secured supply chain, formalized through the 2025 bilateral framework (Australian Government Department of Foreign Affairs and Trade, 2026). Canberra has also legislated and budgeted to encourage domestic processing and refining, explicitly aiming to move beyond extraction (Reuters, 2025). These policy signals are shaping investment narratives around “mines-to-metals” supply chains outside China.

Southeast Asia acts as a pressure zone due to domestic rulemaking, territorial control, and market influence. Indonesia’s downstreaming agenda uses export restrictions and permitting to channel ore into domestic smelting and processing, reshaping regional supply routes and contracting expectations (IEA, 2022; Nangoy, 2025). Myanmar illustrates a different pathway. Since late 2024, armed-group control in the northern rare-earth belt has disrupted exports and sharply reduced China’s imports, generating supply shocks without new formal trade measures (Ghoshal et al., 2025). In both cases, the reliability of supply networks is ultimately shaped by shifting policy and security conditions, which serve to recalibrate perceptions of risk and dictate which connections endure in the face of uncertainty. This logic yields two practical signals. Diversification becomes materially meaningful only when non-China processing projects move from announcements to sustained throughput and contracted offtake. Boundary hardening is more likely when tightening at chokepoints becomes durable, reflected in sustained licensing stringency and repeated upstream disruptions that increase contracting and financing risk across the region.

Zooming out, the Indo-Pacific’s new dividing line is shaped less by geography than by the intersection of industrial capability and regulatory trust. The 2025 U.S. NSS hastens the shift away from open-market globalization toward managed networks, where access depends on midstream processing capacity, shared compliance standards, and the discretion of licensing authorities. In this environment, the policy focus is on building up non-China midstream options and reducing the uncertainty created by shifting rules. As these dynamics deepen, the key boundaries will be those that determine which supply chains stay financeable, contractable, and reliable.

References

Australian Government Department of Foreign Affairs and Trade. (2026, January 12). Critical Minerals | Australia in the USA. Embassy.gov.au. https://usa.embassy.gov.au/critical-minerals 

Chan, K., Czin, J. A., Heerman, K., Sisson, M. W., O’Hanlon, M. E., Rapp-Hooper, M., Kim, P. M., Hass, R., & Thornton, S. A. (2025, November 5). What happened when Trump met Xi? Brookings. https://www.brookings.edu/articles/what-happened-when-trump-met-xi/ 

Ghoshal, D., Mcpherson, P., Lv, A., & Arora, N. (2025, March 28). Myanmar rebels disrupt China rare earth trade, sparking regional scramble. Reuters. https://www.reuters.com/world/asia-pacific/myanmar-rebels-disrupt-china-rare-earth-trade-sparking-regional-scramble-2025-03-28/ 

IEA. (2022, October 31). Prohibition of the export of nickel ore. IEA. https://www.iea.org/policies/16084-prohibition-of-the-export-of-nickel-ore 

IEA. (2025). Global critical minerals outlook 2025. In IEA (pp. 8–9, 174–175). https://www.iea.org/reports/global-critical-minerals-outlook-2025 

Japan Today. (2026, January 18). China tightens screening of Japan-bound rare earth exports. Japantoday.com. https://japantoday.com/category/business/china-tightens-screening-of-japan-bound-rare-earth-exports 

Nangoy, F. (2025, February 18). Indonesia amends mining law to boost access, support processing. Reuters. https://www.reuters.com/world/asia-pacific/indonesian-parliament-set-vote-amendment-mining-law-2025-02-18/ 

Obayashi, Y. (2026, January 12). Japan sets sail on rare earth hunt as China tightens supplies. Reuters. https://www.reuters.com/world/asia-pacific/japan-sets-sail-rare-earth-hunt-china-tightens-supplies-2026-01-12 

Reuters. (2025, February 11). Australia passes tax incentives law for critical minerals. Reuters. https://www.reuters.com/markets/commodities/australia-passes-tax-incentives-law-critical-minerals-2025-02-11/ 

Reuters. (2026, January 20). Chinese exports of rare earth magnets to Japan fall in December. Reuters. https://www.reuters.com/world/asia-pacific/chinese-exports-rare-earth-magnets-japan-fall-month-december-continued-decline-2026-01-20 

Shiquan, D., & Deyi, X. (2022). The security of critical mineral supply chains. Mineral Economics, 36. https://doi.org/10.1007/s13563-022-00340-4 

Sojitz Corporation. (2025, October 30). Sojitz Begins Import of Heavy Rare Earths from Australia｜ News Room｜Sojitz Corporation. Sojitz Corporation. https://www.sojitz.com/en/news/article/topics-20251030.html 

Takenaka, K. (2026, January 14). Two-thirds of Japan firms see tension with China hurting economy: Reuters poll. Reuters. https://www.reuters.com/world/asia-pacific/two-thirds-japan-firms-see-tension-with-china-hurting-economy-2026-01-14 

The White House. (2025). National security strategy of the United States of America. https://www.whitehouse.gov/wp-content/uploads/2025/12/2025-National-Security-Strategy.pdf 

U.S. Geological Survey. (2025). Mineral commodity summaries 2025. In Mineral Commodity Summaries. https://pubs.usgs.gov/publication/mcs2025