Washington on Tuesday said Beijing continued to foster the theft of American technological know-how, with officials there exacerbating matters in recent months.
The renewed accusations from President Donald Trump's administration come as markets grow pessimistic that the world's two largest economies can resolve their burgeoning trade war any time soon.
In an update to a report issued in March, the Office of US Trade Representative Robert Lighthizer said Tuesday that China had not remedied practices long criticized by the United States and other major economies.
"This update shows that China has not fundamentally altered its unfair, unreasonable, and market-distorting practices that were the subject of the March 2018 report on our Section 301 investigation," Lighthizer said.
American authorities accuse China of seeking global industrial dominance in cutting-edge sectors like robotics and renewable energies through a variety of illicit means: stealing American intellectual property by forcing or pressuring US companies present in China to surrender it or through state-sponsored corporate acquisitions, hacking and industrial espionage as well as massive state subsidization and dumping.
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Beijing rejects the charges but Brussels and Tokyo have joined Washington in denouncing Chinese trade practices. The three economies issued a joint statement on the subject in September.
The report released Tuesday said China "indeed appears to have taken further unreasonable actions in recent months."
The report cited the conclusions of civilian cybersecurity firms, according to which Chinese hacking efforts had continued unabated, with state-sponsored entities targeting "cloud computing, Internet of Things, artificial intelligence, biomedicines, civilian space, alternative energy, robotics, rail, agricultural machinery, and high-end medical devices sectors."
In October, the Justice Department also announced charges against Chinese intelligence officers and agents accused of overseeing cyber-theft of intellectual property and confidential information from aerospace and high-tech companies.
Trump and Chinese President Xi Jinping are due to discuss trade when they meet later this month during the Group of 20 summit in Argentina.
Trump has enacted punishing tariffs on more than USD250 billion in imports from China, which has in turn put counter-tariffs on more than USD100 billion in goods China buys from America.
Trump on Tuesday reiterated a threat to put tariffs on all Chinese imports if Beijing failed to satisfy his demands.
US duty rates on USD200 billion in Chinese goods are due to rise to 25 percent in January if no resolution is reached.
US stocks have fallen hard this week, pushed lower in part because of a standoff at the weekend's Asia-Pacific Economic Cooperation summit that revived worries about the US-China trade rift. The meeting ended for the first time in APEC history without a group communique.