There has been a subtle change of tone from Joe Biden and Boris Johnson about the likelihood of a Russian invasion of Ukraine. It has gone from ‘highly likely’ to ‘there may be a diplomatic solution’ — or from ‘almost all hope lost’ to ‘chink of hope’.

So from where does that hope emanate? Largely, I am told, from noises out of Ukraine that its government is moving towards a public statement that although it retains the right to join the Nato western defence alliance, it will commit to not consider applying for at least ten years.