China then claims a 12 nautical mile (nm) territorial sea from the Paracel baseline, not from the individual islands, and in the Spratlys from many features that under international law are not awarded this right, such as artificial islands. Moreover, China’s interpretation of the territorial sea is that the state has the exclusive right to make, apply and execute its own laws in that space without foreign interference. But according to UNCLOS, all ships, civilian or military, enjoy the right of innocent passage through other states’ territorial seas. Moreover, the contiguous zone is considered part of international waters, and states do not have the right to limit navigation or exercise any control for security purposes.
Lastly, China claims 200 nm from the end of the territorial sea as its exclusive economic zone (EEZ), where it claims to have the right to regulate military activity. The US insists that freedom of navigation of military vessels is a universally established and accepted practice enshrined in international law – in other words, states do not have the right to limit navigation or exercise any control for security purposes in EEZs. Australia shares this view, but not all countries accept this interpretation. Argentina, Brazil, India, Indonesia, Iran, Malaysia, the Maldives, Oman, and Vietnam agree with China that warships have no automatic right of innocent passage in their territorial seas. Twenty other developing countries (including Brazil, India, Malaysia, and Vietnam) insist that military activities such as close-in surveillance and reconnaissance by a country in another country’s EEZ infringe on coastal states’ security interests and therefore are not protected under freedom of navigation.
In other words, while international law may support the position of the US and Australia on legal behavior within the EEZs, countries need to work harder to solidify this norm more broadly.
Through these three positions alone on internal waters, territorial seas and EEZs, China lays claim to approximately 80% of the South China Sea. Then China uses the nine-dash line to cover the remaining territory and provide redundancy by claiming “historic waters” – i.e., that China has historically controlled this maritime environment – again, a view that has no basis in international law.
The US has taken steps to challenge the false legal basis of China’s claims. This is the main purpose behind freedom-of-navigation operations, or FONOPS – to demonstrate through action that the US does not accept China’s position that areas are not international waters but internal or territorial waters. In other instances, the US is signaling that it does not accept an area to be in China’s EEZ, although China would not have the right to regulate military activity there anyway.
But undermining China’s false legal claims will take more than military operations and harsh statements. In 2016, the Hague Tribunal ruled that China’s claims of historic rights in the South China Sea lacked legal foundation, China’s actions in the region infringed on the rights of the Philippines, and features in the Spratlys are not entitled to EEZs or territorial zones. Yet Washington’s ongoing refusal itself to ratify UNCLOS undermines the general effectiveness of pushing back against Beijing with legal tools of statecraft. Additionally, Washington squandered an opportunity to support the Philippines in enforcing the international legal tribunal’s 2016 ruling in its favor, further reducing the attractiveness for other claimants to challenge Beijing on legal grounds.
The US should not make the same mistake twice. It should support other claimants that may want to pursue legal action against China (Vietnam is currently considering this course of action). Then, when the tribunal rules once more against China, the US should lead the charge to enforce the ruling.
China is using all the tools of statecraft at its disposal to gain control over this vital strategic waterway. The US and its allies should do the same.