The betrayal of Ukraine is a final warning to the UK and its continental allies to put a lot more energy and money into rebuilding their defences

It was, Sir Keir Starmer told members of his inner circle, one of his most meaningful visits abroad. In the middle of last month, he flew to Kyiv to double-down on the commitment to back Ukraine’s struggle for freedom, a pledge he first made a defining feature of his leadership when Labour was in opposition. Hands were warmly clasped with Volodymyr Zelenskyy, wailing air raid sirens greeted a Russian drone attack, financial promises were made, and signatures were inscribed on a 100-year partnership treaty. The prime minister solemnly intoned the western mantra about backing the resistance to Russian tyranny “for as long as it takes” for Ukraine to become “free and thriving once again”.

All of which now sounds for the birds, thanks to Donald Trump. It was with his trademark contempt for his country’s traditional allies that the US president blindsided them by announcing that he had initiated peace negotiations with Vladimir Putin over the heads of Ukraine and the European members of Nato. The UK received no more warning of this bombshell than anyone else. So much for the vaunted “special relationship”. The US defence secretary, Pete Hegseth, then unleashed another punch to the solar plexus of European security by publicly declaring that Ukraine would have to accept the surrender of large chunks of its territory and should forget about becoming a member of Nato. The future defence of Ukraine, he went on to declare, would be down to Europe, because the US wouldn’t be sending any of its troops to sustain a security guarantee.