China let the yuan breach the key 7-per-dollar level on Monday for the first time in more than a decade, in a sign Beijing might be willing to tolerate more currency weakness that could further inflame a trade conflict with the United States.

The sharp 1.4% drop in the yuan comes days after U.S. President Donald Trump stunned financial markets by vowing to impose 10% tariffs on the remaining $300 billion of Chinese imports from Sept. 1, abruptly breaking a brief ceasefire in a bruising trade war that has disrupted global supply chains and slowed growth.

Some analysts said the yuan move could unleash a dangerous new front in the trade hostilities – a currency war.

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