A Chinese ship embroiled in a stand-off with Vietnamese vessels last year has returned to waters near Vietnam as the United States accused China of pushing its presence in the South China Sea while other claimants are pre-occupied with the coronavirus. Vietnamese vessels last year spent months shadowing the Chinese Haiyang Dizhi 8 survey vessel in resource-rich waters that are a potential global flashpoint as the US challenges China’s sweeping maritime claims. China and Vietnam ‘likely to clash again’ as they build maritime militias On Tuesday, the ship, which is used for offshore seismic surveys, appeared again 158km off Vietnam ’s coast, within its exclusive economic zone (EEZ), flanked by at least one Chinese coastguard vessel, according to data from Marine Traffic, a website that tracks shipping. At least three Vietnamese vessels were moving with the Chinese ship, according to data issued by the Marine Traffic site. About 50 nm ahead of Haiyang Dizhi 8 is a group of at least 3 #China Coast Guard ships, including the largest 5901. #SouthChinaSea pic.twitter.com/drY6niLK1z — South China Sea News (@SCS_news) April 14, 2020 The presence of the Haiyang Dizhi 8 in Vietnam’s EEZ comes towards the scheduled end of a 15-day nationwide lockdown in Vietnam aimed at curbing the spread of the coronavirus. It also follows the sinking of a Vietnamese fishing boat near islands in the disputed waters this month , an act that drew a protest from Vietnam and accusations that China had violated its sovereignty and threatened the lives of its fishermen. The US, which last month sent an aircraft carrier to the central Vietnamese port of Da Nang , said it was “seriously concerned” about China’s reported sinking of the vessel. “We call on the PRC to remain focused on supporting international efforts to combat the global pandemic, and to stop exploiting the distraction or vulnerability of other states to expand its unlawful claims in the South China Sea,” the US State Department said in a statement, referring to China. The Philippines , which also has disputed claims in the South China Sea, has raised its concerns too. On Saturday, the Global Times , published by the official People’s Daily newspaper of China’s ruling Communist Party, said Vietnam had used the fishing boat incident to distract from its “ineptitude” in handling the coronavirus. Vietnam’s Ministry of Foreign Affairs did not immediately respond to a request for comment. Helped by a mass quarantine and aggressive contact-tracing, Vietnam has recorded 265 cases of the novel coronavirus and no deaths. Nearly 122,000 coronavirus tests have been carried out in Vietnam. Coronavirus: what’s behind Vietnam’s containment success? China and Vietnam have for years been at loggerheads over the potentially energy-rich waters, called the East Sea by Vietnam. China’s U-shaped “nine-dash line” on its maps marks a vast expanse of the waters that it claims, including large parts of Vietnam’s continental shelf where it has awarded oil concessions. Malaysia and Brunei claim some of the waters that China claims to the south. During the stand-off last year, at least one Chinese coastguard vessel spent weeks in waters close to an oil rig in a Vietnamese oil block, operated by Russia’s Rosneft, while the Haihyang Dizhi 8 conducted suspected oil exploration surveys in large expanses of Vietnam’s EEZ. “The deployment of the vessel is Beijing’s move to once again baselessly assert its sovereignty in the South China Sea,” said Ha Hoang Hop, at the Singapore-based ISEAS-Yusof Ishak Institute. “China is using the coronavirus distraction to increase its assertiveness in the South China Sea, at a time when the US and Europe are struggling to cope with the new coronavirus.” Sign up now and get a 10% discount (original price US$400) off the China AI Report 2020 by SCMP Research. Learn about the AI ambitions of Alibaba, Baidu & JD.com through our in-depth case studies, and explore new applications of AI across industries. The report also includes exclusive access to webinars to interact with C-level executives from leading China AI companies (via live Q&A sessions). Offer valid until 31 May 2020.