Donald Trump was on a fresh collision course with the Ukrainian president, Volodymyr Zelenskyy, and European allies after a stunning agreement to buy Russian diesel, upending years of US and western pressure on the Kremlin to end its four-and-a-half year war against Ukraine.

Zelenskyy reacted furiously to Trump’s announcement of the deal with Vladimir Putin , calling it “absolutely terrible” and “not fair and not honest”.