Beijing: China has imposed export controls on 10 US companies linked to defence and rare earths mining and barred government agencies from buying products from dozens more American firms, escalating tensions with Washington.

Beijing said the measures were a response to a recent US blacklist that added 80 Chinese companies and subsidiaries accused of supporting China's military.

The Chinese commerce ministry said the export controls were aimed at safeguarding national security and countering what it described as Washington's "Chinese military enterprise list". The restrictions cover 10 firms, including Oshkosh Defense, a manufacturer of military vehicle fleets, and Aveox, which holds aerospace defence contracts with the US military.

Separately, China's finance ministry announced that public procurement agencies would be prohibited from purchasing products from 46 US companies, including Lockheed Martin, Raytheon and Boeing's defence division. The ban took effect on Monday.

The latest measures come just a month after US President Donald Trump visited Beijing for talks with Chinese President Xi Jinping aimed at easing strained relations between the world's two largest economies.

Companies with US investments in China will be exempt from the procurement restrictions, according to the finance ministry.

Among the Chinese firms added to the recent US blacklist were technology giants Alibaba and Baidu, as well as electric vehicle manufacturer BYD.