_China joined the WTO and grew into an economic giant in the time the US was fixated on fighting al-Qaeda. Its a lesson Trump appears not to have learned

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Despite designating China a strategic adversary, the assassination of Soleimani threatens to pitch the US into another bruising Middle East conflict

US President Donald Trumps decision to order the assassination of Qassem Soleimani, Irans most powerful military commander, has raised the spectre, albeit still distant, of all-out war between the United States and the Islamic Republic. There is only one winner in this situation: China.

With Trumps latest blunder, history may not be repeating itself, but it is certainly rhyming. When George W. Bush began his presidency in January 2001, his neoconservative advisers identified China as the biggest long-term threat to the US. So his administration labelled China a strategic competitor and set to work on containing Americas Asian rival.

In April 2001 the same month that a US Navy spy plane accidentally collided with a Chinese fighter jet while on a routine surveillance mission over the South China Sea the US announced the sale of a weapons package to Taiwan over Chinese protests. Bilateral relations plunged to their lowest point since the normalisation of diplomatic ties in 1979.

Everything changed on September 11, 2001, when the US was struck by the single deadliest terrorist attack in history. The Bush administration became so preoccupied with retaliating against al-Qaeda an objective that led to the catastrophic decision to invade Iraq two years later that it all but forgot the distant spectre of an Asian superpower.

Just three months after 9/11, the Bush administration signed off on Chinas accession[4]to the World Trade Organisation, and Chinas economy shifted into high gear. In 2000, Chinas economic output amounted to US$1.21 trillion less than 12 per cent of US gross domestic product. By the end of Bushs second term, in 2008, Chinas GDP had reached US$4.6 trillion more than 31 per cent of Americas. Today, Chinas GDP stands at about 65 per cent of the US level.

In this sense, China owes its economic miracle to the 9/11 terrorist attacks or, more precisely, to the Bush administrations disastrous response. Two decades from now, we may well be saying the same about the Soleimani assassination.

Like Bush, when Trump entered the White House, his administration quickly branded China Americas top geopolitical adversary and adopted a confrontational policy, exemplified by a trade war that, despite a phase one agreement has yet to be resolved. In effect, Trump revived great power competition focused primarily on containing China as the organising principle of US foreign policy.

Then Trump had Soleimani killed, and all eyes turned towards Iran. If the conflict continues to escalate even if it stops short of all-out war the US will most likely redirect significant resources towards confronting the Islamic Republic, and, like after 9/11, move China to the foreign-policy back-burner.

For Chinese President Xi Jinping, capitalising on this shift will require a carefully calibrated response. The events unfolding in the Middle East present a tantalising strategic opportunity for China. But, as Xi probably recognises, his best bet is to declare support for Iran and continue to import Iranian oil surreptitiously, in defiance of US sanctions but avoid provoking Trump, say, by supplying weapons to the Iranians.

But, even as China limits its involvement, it cannot go entirely unnoticed. The countrys growing power and Americas interest in containing it will factor into the strategic calculus of both sides in the US-Iran conflict.

Iran has already effectively declared that the 2015 nuclear deal, the Joint Comprehensive Plan of Action, is dead, announcing that its nuclear programme will now have no limitations in production, including enrichment capacity.

If Irans leaders believe that the US will seek to avoid committing the same strategic mistakes as Bush, including vis–vis China, they may opt for bolder retaliation.

As for the US, the more sober-minded in Washington will undoubtedly advocate a measured response to any Iranian retaliation, not least to avoid losing sight of the China challenge.

But Trumps own calculations are driven largely by his desire to present a tough guy image to voters in advance of this Novembers presidential election (precisely what he accused his predecessor Barack Obama of planning in 2011). And he is surrounded by far more inexperienced sycophants than qualified advisers.

Seventeen years ago, Bush entered into a war of choice in the Middle East that, besides costing huge amounts of US blood and treasure, derailed efforts to contain China. Trump can still avoid making the same mistake.

But, with every unhinged tweet for example, threatening to attack Iranian cultural sites (a war crime) if the country retaliates the chances that strategic sanity will prevail seem to grow smaller, and Xis hopes for the new year grow brighter.

Minxin Pei is professor of government at Claremont McKenna College and a non-resident senior fellow at the German Marshall Fund of the United States.