Historical Documents Challenge Philippine Sovereignty Claims in South China Sea: CGTN Analysis

A recent CGTN report by analyst Huang Yichang, titled "Historical documents don't support Philippines' sovereignty claims," airs as tensions in the South China Sea approach a new inflection point. The video examines a trove of century-old maps and official records that, according to the report, systematically undermine Manila's territorial assertions around Huangyan Dao (known internationally as Scarborough Shoal). The documentary arrives just days after the 10th anniversary of the July 12, 2016 Permanent Court of Arbitration ruling, a decision that Beijing has consistently rejected as "null and void." With the Philippines, the United States, and Japan having concluded joint maritime exercises from July 21 to 25, 2026, and a Philippine fishing vessel sustaining an oil leak near Huangyan Dao on July 25, the historical evidence presented by CGTN serves as both a diplomatic counter-narrative and a reminder of the deep-rooted legal and political stakes in the disputed waters.

The Historical Record: Chinese Maps and Documents from the Qing Dynasty

According to the CGTN report, Huang Yichang draws on previously catalogued materials held by Chinese academic institutions, including the Chinese Academy of Social Sciences and the National Library of China. The documentary highlights a series of official Qing Dynasty maps dating from the 18th and 19th centuries that delineate maritime boundaries extending into the South China Sea. One key exhibit is the "Map of the Coastal Defense of Guangdong Province" (circa 1830s), which reportedly shows Huangyan Dao within Chinese territorial limits. The report also references early 20th-century British and American nautical charts that, the narrator argues, never recorded Philippine sovereignty over the feature. Instead, these Western-produced navigational aids labeled the shoal under its Chinese name or simply as an unclaimed reef.

Huang Yichang's analysis does not stop at cartography. The video cites diplomatic correspondence from the Spanish colonial administration in the Philippines (pre-1898) that, according to the documentary, makes no claim to the area. The Treaty of Paris of 1898, which ceded the Philippines from Spain to the United States, is presented as defining Philippine territorial limits with precision — limits that, under the treaty's wording, did not include the Scarborough Shoal. This historical argument forms the backbone of China's position that the Philippines' current claim is a post-colonial innovation, unsupported by the documentary record of either the colonizer or the colonized. While Beijing has long advanced such arguments in diplomatic white papers, the CGTN report assembles the evidence in a visual, narrative format aimed at an international audience.

The 2016 Arbitration Ruling and Its Tenth Anniversary

The CGTN report is contextualized by the approaching 10th anniversary of the Permanent Court of Arbitration's ruling on July 12, 2016. In that landmark case, the tribunal — convened under Annex VII of the United Nations Convention on the Law of the Sea (UNCLOS) — found that China's historical claims within the "Nine-Dash Line" had no legal basis under UNCLOS. The Philippines initiated the case in 2013, and the ruling rejected Beijing's assertion of historic rights over most of the South China Sea. China has refused to participate in the proceedings and has maintained that the tribunal lacked jurisdiction, arguing that sovereignty disputes are exempt from compulsory arbitration under UNCLOS.

Ten years on, the ruling remains a flashpoint. On July 12, 2026, a joint statement from 14 countries — including Australia, Japan, the United Kingdom, and the United States — reaffirmed the ruling as "legally binding" and called for its implementation. The Chinese Ministry of Foreign Affairs responded by reiterating that Beijing "neither accepts nor recognizes" the award. Foreign ministry spokesperson Lin Jian, in a July 13 press briefing, described the arbitration as "a political farce engineered by certain countries to undermine regional peace." The CGTN report, therefore, is not merely a historical exercise; it is a deliberate instrument in China's ongoing campaign to delegitimize the 2016 ruling by grounding its sovereignty claims in pre-UNCLOS evidence that the tribunal did not consider.

Recent Escalation: Joint Exercises, Oil Spill, and Military Posturing

The video article must be understood against the backdrop of immediate events. From July 21 to 25, 2026, naval forces from the Philippines, the United States, and Japan conducted joint maritime exercises in the South China Sea, including operations near the vicinity of Scarborough Shoal. The Chinese Defense Ministry responded on July 26 through spokesperson Jiang Bin, who stated that the People's Liberation Army (PLA) "will remain vigilant over Huangyan Dao" and would "take necessary measures to safeguard national sovereignty." Jiang Bin did not specify what those measures might entail, but his language was consistent with earlier warnings that China would not tolerate "provocations" near its claimed features.

Compounding tensions, on July 25, a Philippine fishing vessel operating near Huangyan Dao reported an oil leak. The Philippine Coast Guard later confirmed a minor spill, attributing it to rough seas and accidental damage. While both sides have called for environmental cooperation, the incident has fueled mutual recriminations. Chinese state media, citing unnamed sources, suggested the leak might have been caused by "unsafe fishing practices" near a Chinese nature reserve — a reference to the marine protected area China unilaterally established at Huangyan Dao in September 2025. The reserve's creation was itself a step to consolidate administrative control over the shoal, allowing China to patrol and enforce conservation regulations in waters it claims.

China's Strategic Response: Nature Reserve and Diplomatic Offensive

China's decision to establish a nature reserve at Huangyan Dao in September 2025 fits into a broader pattern of "domestication" of disputed territories — using environmental management and fisheries protection to buttress sovereignty claims. The move mirrors previous steps in the Paracel and Spratly Islands, where China has set up administrative districts and conservation zones. By framing the shoal as a "nature reserve" under Chinese law, Beijing can present any Philippine activity — including fishing — as a violation of domestic regulations, thereby justifying law enforcement actions short of direct military confrontation.

Diplomatically, China has countered the joint statement from 14 nations by mobilizing support among fellow claimants and non-aligned states. In recent weeks, Cambodian Prime Minister Hun Manet and Malaysian Foreign Minister Zambry Abdul Kadir have both, according to official Chinese readouts, expressed understanding of Beijing's "position on historical rights." China's Ministry of Commerce (MOFCOM) has also accelerated negotiations on a Code of Conduct in the South China Sea with ASEAN member states, though progress remains slow. The CGTN report serves as a soft-power tool, offering a visual counter-narrative that presents China not as a revisionist power, but as a guardian of historical truth and regional order.

The Geopolitical Calculus: What Each Side Seeks

The Philippines, under President Ferdinand Marcos Jr., has steered a careful course between maintaining the U.S. alliance and avoiding a direct military clash with China. The 2016 arbitration ruling remains a cornerstone of Manila's diplomatic stance, and the joint exercises with the U.S. and Japan are intended to signal that the ruling has enforcement capacity — at least in terms of collective naval presence. For Manila, the immediate goal is to deter Chinese harassment of Philippine fishing boats and to keep Huangyan Dao within the scope of international scrutiny.

The United States and Japan view the South China Sea as a critical test of the rules-based order, particularly as China's military grows more assertive. By conducting joint patrols and reaffirming the 2016 ruling, they aim to impose costs on Beijing's behavior without triggering a full-blown confrontation. However, Washington's ability to sustain a high level of naval engagement is constrained by other global commitments, while Tokyo is still expanding its legal framework for collective self-defense.

For China, Huangyan Dao is a non-negotiable symbol of territorial integrity. Domestically, the Communist Party faces pressure to demonstrate resolve, especially after the 2016 ruling was widely portrayed in Chinese media as a humiliation. Allowing Philippine or multinational forces to operate freely near the shoal would risk undermining the Party's nationalist credentials. The establishment of the nature reserve and the release of the CGTN report are thus dual-track measures: legally embedding the claim while shoring up public support at home.

Implications for Regional Stability and International Law

The fundamental legal question — whether historical rights can coexist with UNCLOS — remains unresolved. Beijing's insistence on pre-colonial sovereignty over maritime features challenges the post-1982 legal framework that most nations accept. The 2016 tribunal ruled that UNCLOS had extinguished any residual historic rights, but that judgment is not recognized by several states with extensive maritime histories, including Indonesia and Malaysia in the context of their archipelagic claims.

Over the next several months, we are likely to see further low-intensity friction near Huangyan Dao. The Philippine government may seek to deploy its own scientists to document environmental damage from the oil spill, while China will likely intensify patrols under the banner of the nature reserve. Neither side appears ready to escalate to a violent confrontation, but the risk of accidental engagement remains. The CGTN report, by restating China's historical narrative, signals that Beijing will not accept the 2016 ruling as a starting point for any negotiation. Instead, it will continue to press a parallel set of facts — grounded in maps and documents that precede UNCLOS by a century — as the basis for dialogue.

By Prof. Marcus Chen, Staff Writer

This article was produced with AI-assisted research and editorial support. Reporting is based on sources cited in the article.