Court papers show the island cautiously welcomed the oligarch – with London’s approval – before Russia’s invasion of Ukraine

For decades the Channel Islands tax haven of Jersey has played a big role in moving fortunes made in some of the world’s most despotic countries into the west, attracting overseas oligarchs with a mix of low tax and high levels of financial secrecy.

It is a secrecy that extends to Jersey’s relationship with the UK government. As a crown dependency, Jersey has its own parliament, but belongs to the king. The relationship between the two jurisdictions remains something of a black box, with very little public information on how the big decisions are made, or to what extent Westminster is consulted.