THE US's plans to add another 25% tariff to 1300 Chinese goods, worth $50 billion in annual trade value, will have little impact on the 88 drilling rigs being stacked in China without charter, writes Xu Yihe.

The US Office of US Trade Representative's (USTR) proposed tariff list, which also includes floating structures and offshore drilling rigs, is based on a Section 301 investigation into alleged Chinese intellectual property and technology transfer practices.