China could impose coordinated countermeasures — including targeted sanctions against companies — if the United States proceeds with deep-sea mining in violation of international law, according to a peer-reviewed academic study published in June 2026. The analysis, authored by Bian Yongmin, a professor of international law at the University of International Business and Economics in Beijing, argues that a coalition of nations could legally push back against unilateral US seabed resource extraction.

The Legal Argument at the Centre of the Debate

Professor Bian Yongmin's analysis, published in the June issue of the peer-reviewed Pacific Journal, contends that the United States remains bound by customary international law governing global seabed resources — even though Washington is not a signatory to the United Nations Convention on the Law of the Sea (UNCLOS). The study argues this legal obligation creates a basis for other nations to treat US seabed mining activities in areas like the Clarion-Clipperton Zone as internationally wrongful acts, opening the door to formal countermeasures. The International Seabed Authority (ISA), the UN-mandated body that oversees deep-sea mineral extraction in international waters, has not sanctioned US commercial mining operations in the region. Companies such as The Metals Company have been advancing seabed mining ambitions in the Clarion-Clipperton Zone, a mineral-rich corridor in the Pacific Ocean that also falls within proximity to American Samoa.

Why It Matters: A New Frontier in Economic Pushback

For decades, the United States has wielded economic and financial restrictions — including sanctions — as primary foreign policy instruments. The academic study signals a potential strategic reversal: as China and allied nations accumulate greater economic and technological leverage, they are actively developing legal and economic frameworks to counter US unilateral actions. State-linked entities such as China Minmetals Corporation hold deep interests in deep-sea mineral supply chains, giving Beijing both commercial and geopolitical incentives to contest US moves in international waters. Polymetallic nodules found in zones like the Clarion-Clipperton Zone contain cobalt, nickel, and manganese — materials critical to electric vehicle batteries and consumer electronics supply chains that link manufacturers from automakers like BMW to tech giants.

Limits of Enforcement: The Realist Caveat

Despite the legal framework outlined in the study, experts acknowledge the practical constraints of enforcement. 'If the United States insists on ignoring international law, it would indeed be difficult to restrain them,' said a Beijing-based international law expert familiar with the proposal, who asked not to be named, citing the sensitivity of the matter. This caveat underscores a recurring tension in international law: the gap between legal entitlement and effective enforcement when a major power chooses non-compliance. The scenario echoes earlier disputes over freedom-of-navigation operations and technology export controls, where legal arguments alone proved insufficient to alter US behaviour.

What's Next: Deep-Sea Mining as a Geopolitical Test Case

The study's publication coincides with intensifying global competition over critical mineral supply chains, with nations racing to secure seabed resources before formal international governance frameworks are fully established. Japan has separately reported rare earth discoveries in deep-sea mud near a remote island, adding further urgency to the race. If the US advances commercial seabed mining without ISA authorisation, the response from China and aligned nations — whether legal, diplomatic, or economic — will serve as a critical stress test for the international rules-based order governing the global commons. Observers should watch for coordinated multilateral statements at the ISA and any formal invocation of countermeasure provisions under customary international law.