This combination of file pictures created on April 4, 2017 shows USPresident Donald Trump in St Louis, Missouri on October 9, 2016 and China's leader Xi Jinping in Beijing on December 5, 2012. Photo: AFP

US President Donald Trump’s latest salvo of tariffs came into effect on dozens of trading partners Wednesday, including punishing 104 per cent duties on imports of Chinese products.

Beijing has consistently opposed tariff rises and said Wednesday it would take “firm and forceful” steps to protect its interests.

Its finance ministry later said in a statement that “additional tariff rates” on imports originating in the United States would “rise from 34 per cent to 84 per cent”, effective from 12:01 pm on Thursday.

“The tariff escalation against China by the United States simply piles mistakes on top of mistakes (and) severely infringes on China’s legitimate rights and interests,” the ministry said.

Washington’s moves “severely damage the multilateral rules-based trade system”, it added.

In a separate statement, Beijing’s commerce ministry said it would blacklist six American artificial intelligence firms, including Shield AI Inc. and Sierra Nevada Corp.

The companies had either sold arms to Taiwan or collaborated on “military technology” with the island, the commerce ministry said.