To see the true face of Donald Trump, look no further than Ukraine. Laid bare in his handling of that issue are not only his myriad weaknesses, but also the danger he poses to his own country and the wider world – to say nothing of the battered people of Ukraine itself.

Don’t be fooled by the mild, vaguely theatrical rebuke Trump issued to Vladimir Putin on Thursday after Moscow unleashed a deadly wave of drone strikes on Kyiv, killing 12 and injuring dozens: “Vladimir, STOP!” Pay attention instead to the fact that, in the nearly 100 days since Trump took office, the US has essentially switched sides in the battle between Putin’s Russia and democratic Ukraine, backing the invaders against the invaded.

On Friday, Trump’s real-estate buddy and special envoy to the Middle East, Steve Witkoff, held talks in Moscow with Putin. But any resemblance between the US and an honest broker is purely coincidental. On the contrary, previous encounters between the two men resulted in Witkoff parroting Kremlin talking points, essentially endorsing Russia’s claim to the Ukrainian territory it seized. In that, Witkoff was merely following the lead set by his boss: the supposed peace deal Trump is now in a hurry to seal amounts to handing Putin almost everything he wants and demanding Ukraine surrender.

Hence Trump’s anger on Wednesday, when he accused Volodymyr Zelenskyy of making “inflammatory statements”. What had the Ukrainian president said that was so incendiary? He had calmly pointed out that he could not do as Trump demanded and recognise Russian control of Crimea, which Russia grabbed in 2014, because it was forbidden by his country’s constitution. It’s telling that Trump should be enraged by a president who thinks constitutions have to be respected.

Whether Trump succeeds in making Kyiv buckle or not, the new reality is clear. The US president is taking an axe to an international order constructed in the aftermath of a bloody world war, a system that has held, however imperfectly, since 1945. A central tenet of that order was that big states could not........

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