Donald Trump will arrive in Beijing this week knowing that Xi holds all the cards | Simon Tisdall

The US president will be counting on China to influence Iran and help him out of his latest mess. But the price may be high – including for Taiwan

Like an out-of-control wrecking ball, swinging wildly back and forth, Donald Trump smashes up the international order without much thought for the consequences. Lacking coherent strategies, workable plans or consistent aims, he power-trips erratically from one fragile region, tense warzone and complex geopolitical situation to another, leaving misery, confusion and rubble in his wake. Typically, he claims a bogus victory, demands that others repair the damage and pick up the tab, then looks around for something new to break.

The president will bulldoze into another international minefield this week – the fraught standoff between China and Taiwan – when he travels to Beijing for a two-day summit with President Xi Jinping. After a string of humiliating policy implosions over Ukraine, Gaza, Nato, Greenland, and now Iran and Lebanon, needy Trump craves a diplomatic success to flaunt at home. But his hopes of vote-winning trade pacts are overshadowed by his latest war of choice. He needs Xi’s promise not to arm Iran if all-out fighting resumes – and Xi’s help keeping the strait of Hormuz open as part of a mooted framework peace deal.