A World Trade Organisation panel has ruled that Trump administration tariffs on 200 billion dollars (£155 billion) of Chinese goods are illegal, vindicating Beijing even if the US has all but incapacitated the WTO’s ability to hand down a final binding verdict.

It is the first time the Geneva-based trade body has ruled against a series of high-profile tariffs that Donald Trump’s government has imposed on a number of countries — allies and rivals alike. The president has repeatedly claimed that the WTO treats the US unfairly.

The WTO’s dispute settlement body ruled against the US government’s argument that China has wrongly engaged in practices harmful to US interests on issues including intellectual property theft and technology transfer.

The ruling, in theory, would allow China to impose retaliatory tariffs on billions in US goods, but it is unlikely to have much practical impact, at least in the short term, because the US can appeal against the decision and the WTO’s appeals court is currently not functioning — largely because of Washington’s single-handed refusal to accept new members for it.

The appeals court issues final rulings in trade cases but stopped functioning last year when the terms of two of its last three judges expired with no replacements.

That means the US can appeal “into the void”, said Timothy Keeler, a lawyer at Mayer Brown and former chief of staff for the US trade representative.

“This panel report confirms what the Trump administration has been saying for four years: the WTO is completely inadequate to stop China’s harmful technology practices,” said US trade representative Robert Lighthizer in a statement.

He said the US had presented “extensive evidence” of China’s intellectual property theft and the WTO has offered no fixes for it.

“The United States must be allowed to defend itself against unfair trade practices, and the Trump administration will not let China use the WTO to take advantage of American workers, businesses, farmers, and ranchers,” he added.

The Chinese ministry of commerce said the ruling was “objective and fair” and called on the US to respect it.

The US tariffs target two batches of Chinese products. Duties of 10% were imposed on 200 billion dollars of goods in September 2018, and were jacked up to 25% eight months later. An additional 25% duties were imposed in June 2018 against Chinese goods worth about 34 billion dollars (£26 billion) in annual trade.

The Trump administration has justified the sanctions under Section 301 of the Trade Act of 1974, once a common tool used by the US government to impose sanctions — and recently revived by Mr Trump.

The US argued that Beijing’s actions had amounted to “state-sanctioned theft” and “misappropriation” of US technology, intellectual property and commercial secrets.

The WTO panel ruled that the US measures violated longstanding international trade rules because they only applied to products from China, and that Washington had not adequately substantiated its claim that the Chinese products hit with the extra duties had benefited from the allegedly unfair Chinese practices.