How strong is Trump's hand in US-China trade war?

A week ago, it looked like the world's two biggest economies were close to resolving their ongoing trade dispute. Now, the United States is imposing a new round of punishing tariff increases on Chinese goods.

Eleventh-hour negotiations got under way on Thursday between a high-level Chinese delegation led by Vice Premier Liu He and US negotiators led by Trade Representative Robert Lighthizer.

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Trump's trade war with China: How we got here, what happens next
The pressure to salvage a trade deal between the two sides ratcheted up on Wednesday after the US formally filed paperwork that would make good on President Donald Trump's Twitter threat earlier in the week to raise tariffs on Chinese imports.

From Friday, tariffs are increasing on $200bn worth of Chinese goods, from 10 to 25 percent. China promises to retaliate but has not offered specifics on possible countermeasures.