Sucking up to Donald Trump never works for long. Narendra Modi is the latest world leader to learn this lesson the hard way. Wooing his “true friend” in the White House, India’s authoritarian prime minister thought he’d conquered Trump’s inconstant heart. The two men hit peak pals in 2019, holding hands at a “Howdy Modi” rally in Texas. But it’s all gone pear-shaped thanks to Trump’s tariffs and dalliance with Pakistan. Like a jilted lover on the rebound, Modi shamelessly threw himself at Vladimir Putin in China last week. Don and Narendra! It’s over! Although, to be honest, it always felt a little shallow.

Other suitors for Trump’s slippery hand have suffered similar heartbreak. France’s Emmanuel Macron turned on the charm, feting him at the grand reopening of Notre Dame Cathedral. But Trump cruelly dumped him after they argued over Gaza, calling him a publicity-seeker who “always gets it wrong”. The EU’s Ursula von der Leyen, desperate for a tete-a-tete, flew to Trump’s Scottish golf course to pay court. Result: perhaps the most humiliating, lopsided trade deal since imperial Britain’s 19th-century “unequal treaties” with Peking’s dragon throne.

The list of broken pledges and dashed hopes is lengthy. Relationships between states normally pivot on power, policy and strategic interests. But with faithless, fickle Trump, it’s always personal – and impermanent. Disconcertingly, he told Mexico’s impressive president, Claudia Sheinbaum, that he “likes her........

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