Concerns are growing over Donald Trump’s plans to strike a deal with Vladimir Putin on Friday

The offer to thrash out a Ukrainian peace deal at a bilateral summit with Trump represents exactly the sort of great-power deal-making Putin has always craved. It will be his first trip to the US since 2007, with the exception of visits to the UN.

Exactly how the Alaska summit will look is still unclear, with a particularly Trumpian kind of confusion and chaos accompanying its announcement. Kyiv, European capitals and even Trump’s own staff have been trying to understand what exactly was agreed in the Kremlin.