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Vietnam
This Week in AsiaPolitics

Are China and Vietnam on collision course over Beijing’s ‘creeping’ demarcation in Gulf of Tonkin?

  • Beijing’s move to set a baseline in the Gulf of Tonkin is a sign of its aim to assert greater control in the strategically important area
  • The demarcation could also be an ‘inevitable step’ towards the disputed Spratly Islands being the next area where Beijing wants to set its lines

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A live-fire drill carried out by the People’s Liberation Army in 2021 in the Gulf of Tonkin, referred to as “Beibu Gulf” by Beijing. Photo: Weibo / PLA
Maria Siow
Vietnam’s inaction to China’s demarcation of its territory in the Gulf of Tonkin where the two countries have unresolved maritime boundaries could be a sign of Hanoi’s desire to discuss the issue behind closed doors.

Analysts say China’s move may not comply with international maritime conventions, adding that Beijing’s “creeping” encroachment shows that it is aiming to assert greater control over an important body of water.

On March 1, Beijing released a statement showing a set of seven base points that, when connected, form the baseline for its territorial claims in the Gulf of Tonkin, known as Beibu Gulf in China.

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The demarcation is in line with the Law on the Territorial Sea and Contiguous Zone promulgated by China in 1992, according to Chinese state tabloid The Global Times, citing the ministry’s Department of Boundary and Ocean Affairs.

The department said on its official WeChat account that the move was necessary to exercise China’s sovereignty and jurisdiction.

Located in the northwestern part of the South China Sea, the Gulf of Tonkin is enclosed by Vietnam’s northern coastline and China’s southern territories including Hainan Island.
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