In the build-up to the Trump-Putin summit in Alaska today, the US president has made vague references to territorial swaps – a terrifying prospect for Ukraine and its allies "given that all the territory in question" is Ukrainian, said the BBC .

Vladimir Putin is said to be demanding control of the Donbas , a region consisting of the Donetsk and Luhansk provinces. Thousands of Ukrainian soldiers have died trying to defend the Donbas, which is home to key industrial assets and millions of people, as well as being a fortified line protecting Ukrainian territory to the north and west.

Volodymyr Zelenskyy has maintained that ceding land is impossible, because Ukraine is prohibited from doing so by its constitution. But Donald Trump appears to be giving this argument short shrift. "I was

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