Territorial disputes in the South China Sea in the context of Natuna Islands

The South China Sea Islands consist of over 250 islands, atolls, cays, shoals, reefs, and seamounts in the South China Sea. The islands are mostly low and small and have few inhabitants. The islands and surrounding seas are subject to overlapping territorial claims by the countries bordering the South China Sea.

The South China Sea Islands constitute a distinct tropical moist broadleaf forest terrestrial ecoregion and the South China Sea Oceanic Islands marine ecoregion.

Maritime security is an umbrella term informed to classify issues in the maritime domain that are often related to national security, marine environment, economic development, and human security. This includes the world's oceans but also regional seas, territorial waters, rivers and ports, where seas act as a “stage for geopolitical power projection, interstate warfare or militarized disputes, as a source of specific threats such as piracy, or as a connector between states that enables various phenomena from colonialism to globalization”. The theoretical concept of maritime security has evolved from a narrow perspective of national naval power projection towards a buzzword that incorporates many interconnected sub-fields. The definition of the term maritime security varies and while no internationally agreed definition exists, the term has often been used to describe both existing, and new regional and international challenges to the maritime domain. The buzzword character enables international actors to discuss these new challenges without the need to define every potentially contested aspect of it. Maritime security is of increasing concern to the global shipping industry, where there are a wide range of security threats and challenges. Some of the practical issues clustered under the term of maritime security include crimes such as piracy, armed robbery at sea, trafficking of people and illicit goods, illegal fishing or marine pollution. War, warlike activity, maritime terrorism and interstate rivalry (such as the Territorial disputes in the South China Sea or conflict in the Strait of Hormuz) are also maritime security concerns.

While a concern throughout history for nation states, maritime security has evolved significantly since the early 2000s, when in particular concerns over terrorist attacks on port facilities sparked interest in security in the maritime domain and led to the creation of the International Ship and Port Facility Security Code. The ISPS Code is enforced through Chapter XI-2 of the SOLAS Convention. Most littoral states and international organisations have also outlined maritime security strategies. It is in particular piracy in Southeast Asia, off the coast of Somalia and in West Africa which has triggered recognition for the detrimental effects of maritime insecurities for economic development, human security as well as the environment. Maritime security is often transnational and goes beyond the maritime domain itself (see liminality). It is characterized as being cross-jurisdictional and/or highly jurisdictional complex.

Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of Mainland Southeast Asia. With an area of about 331,000 square kilometres (128,000 sq mi) and a population of over 102 million, it is the world's 16th-most populous country. One of two communist states in Southeast Asia, Vietnam is bordered by China to the north, and Laos and Cambodia to the west; it lies along the Gulf of Thailand to the southwest and the South China Sea to the east, where it has shared and disputed maritime borders with other countries. Its capital is Hanoi, while its largest city is Ho Chi Minh City.

Vietnam was inhabited by the Paleolithic age, with states established in the first millennium BC on the Red River Delta in modern-day northern Vietnam. The Han dynasty annexed northern and central Vietnam, which were subsequently under Chinese rule from 111 BC until the first dynasty emerged in 939. Successive monarchical dynasties absorbed Chinese influences through Confucianism and Buddhism, and expanded southward to the Mekong Delta, conquering Champa. During most of the 17th and 18th centuries, Vietnam was effectively divided into two domains of Đàng Trong and Đàng Ngoài. The Nguyễn—the last imperial dynasty—surrendered to France in 1883. In 1887, its territory was integrated into French Indochina as three separate regions. In the immediate aftermath of World War II, the Viet Minh, a coalition front led by the communist revolutionary Ho Chi Minh, launched the August Revolution and declared Vietnam's independence from the Empire of Japan in 1945.

Xi Jinping succeeded Hu Jintao as General Secretary of the Chinese Communist Party (CCP) in 2012, and later in 2016 was proclaimed the CCP's fourth leadership core, following Mao Zedong, Deng Xiaoping, and Jiang Zemin.

While overseeing China's domestic policy, Xi has introduced far-ranging measures to enforce party discipline and strengthen internal unity. His anti-corruption campaign led to the downfall of prominent incumbent and retired CCP officials, including former PSC member Zhou Yongkang. For the sake of promoting "common prosperity", Xi has enacted a series of policies designed to increase equality, overseen targeted poverty alleviation programs as part of the battle against poverty, and directed a broad crackdown in 2021 against the tech sector, as well as drastically curtailing the tutoring industry and reducing homework burdens. Furthermore, he has expanded support for state-owned enterprises (SOEs), emphasized advanced manufacturing and tech development, advanced military-civil fusion, and led attempts to reform China's property sector. Following the onset of the COVID-19 pandemic in mainland China, he initially presided over a zero-COVID policy from January 2020 to December 2022 before ultimately shifting towards a mitigation strategy after COVID-19 protests occurred. In foreign policy, Xi emphasizes the Community of Common Destiny. He seeks to increase China's ability to shape international norms in emerging policy areas (described as "new frontiers") like space and the internet, where China can position itself as an early entrant. Xi also seeks to increase China's discourse power, which he frames as China's "right to speak." Xi has pursued a more hardline foreign policy particularly with regard to China's relations with the United States, the nine-dash line in the South China Sea, and the Sino-Indian border dispute. Additionally, for the sake of advancing Chinese economic interests abroad, Xi has sought to expand China's influence in Africa and Eurasia by championing the Belt and Road Initiative.

The relationship between the People's Republic of China (PRC) and the United States (US) has been complex and at times tense since the establishment of the PRC on 1 October 1949 and subsequent retreat of the government of the Republic of China to Taiwan. After the normalization of relations in the 1970s, the US–China relationship has been marked by persistent disputes including China's economic policies, the political status of Taiwan and territorial disputes in the South China Sea. Despite these tensions, the two nations have significant economic ties and are deeply interconnected, while also engaging in strategic competition on the global stage. As of 2025, the US and China are the world's largest and second-largest economies by nominal GDP. Collectively, they account for 44.2% of the global nominal GDP.

The proclamation of the PRC in Beijing by the Chinese Communist Party (CCP) chairman Mao Zedong created a new central government on the mainland in October 1949. Relations between the US and the new Chinese government quickly soured, culminating in direct conflict during the Korean War. The US-led United Nations intervention was met with Chinese military involvement, as China sent millions of soldiers to prevent a US-aligned presence on its border. For decades, the US did not formally recognize the PRC, instead maintaining diplomatic relations with the Republic of China (ROC) based in Taiwan, and as such blocked the PRC's entry into the United Nations. However, shifting geopolitical dynamics, including the Sino-Soviet split, the winding down of the Vietnam War, as well as of the Cultural Revolution, paved the way for US President Richard Nixon's 1972 visit to China, ultimately marking a sea change in US–China relations. On 1 January 1979, the US formally established diplomatic relations with the PRC and recognized it as the sole legitimate government of China, while maintaining unofficial ties with Taiwan via the Taiwan Relations Act, which endures as a major point of contention.