China Erupts at Japan As 14 Nations Oppose Beijing's South China Sea Claim

China has lodged a formal protest with Japan after Tokyo joined 13 other countries in reaffirming the 2016 Hague ruling that rejected Beijing’s sweeping South China Sea claims.

China has summoned Japan’s senior envoy in Beijing after Tokyo joined a coalition of 14 countries in reaffirming the landmark 2016 Hague tribunal ruling that rejected Beijing’s expansive claims in the South China Sea.

The diplomatic protest marks Beijing’s latest attempt to push back against growing international support for the ruling, which China continues to reject despite its legal standing under international law.

According to China’s Foreign Ministry, officials lodged what they described as “solemn representations” and expressed “strong dissatisfaction and protest” over Japan’s position, accusing Tokyo of interfering in regional affairs and undermining peace and stability. The confrontation erupted on the tenth anniversary of the Permanent Court of Arbitration’s decision in favour of the Philippines, a judgment that concluded China’s so-called “nine-dash line” has no legal basis under the United Nations Convention on the Law of the Sea (UNCLOS).

Japan was among 14 countries—including the United States, United Kingdom, Australia, Canada, Germany, Italy, New Zealand and the Philippines—that jointly reaffirmed the tribunal’s findings. The group described the 2016 decision as “a significant milestone” that remains “final, legally binding and definitive” regarding the maritime claims examined by the tribunal.

Japanese Foreign Minister Toshimitsu Motegi said China’s continued refusal to accept the ruling runs “against the principle of peaceful settlement of disputes” and undermines the international rule of law. The joint statement also called for maritime disputes to be resolved peacefully under international law and opposed the use of military forces, coast guard vessels and maritime militia to intimidate other claimants in disputed waters.

Separately, the European Union described the tribunal’s judgment as a “landmark decision in the peaceful settlement of disputes.”

China dismissed both the joint declaration and Japan’s remarks. The Foreign Ministry accused Tokyo of endorsing what it called an “illegal award” and insisted Japan had no legitimate standing in the dispute. In comments carried by Chinese state media, Beijing also accused Japan of attempting to interfere in the South China Sea under the guise of being a regional stakeholder.

The ministry went further, alleging that Tokyo’s actions revived memories of Japan’s wartime expansionism and warning against what it characterised as a “neo-militarism agenda.” China has consistently refused to recognise the 2016 tribunal’s jurisdiction, maintaining that its sovereignty over the South China Sea “has never changed.”

Officials again dismissed the ruling as “a piece of waste paper” that they described as illegal, invalid and non-binding. To reinforce that position, the Foreign Ministry released a video titled “What the South China Sea Waves Tell Us,” portraying the disputed waterway as an inseparable part of Chinese civilisation and history.

The South China Sea remains one of the world’s most strategically important waterways, carrying roughly one-third of global maritime trade each year. China claims most of the sea through its controversial nine-dash line, a claim that overlaps with those of the Philippines, Vietnam, Malaysia, Brunei and Taiwan.

The arbitration case, brought by the Philippines in 2013, concluded that China possessed no historic rights over resources within the nine-dash line and that several of Beijing’s activities violated UNCLOS. Although the ruling is legally binding on the parties involved, Beijing has refused to recognise it and has continued expanding its military, coast guard and maritime presence across the disputed waters.

The latest diplomatic confrontation suggests the legal and geopolitical battle over the South China Sea remains far from settled, with Beijing showing no sign of softening its position despite increasingly coordinated international support for the Hague ruling.