This BBC report has a bit more context, but to summarise:

- Roman Abramovich bought Chelsea in 2003 for £140M

- In total, Abramovich has loaned the club more than £1.5bn.

- Abramovich, 55, is alleged to have strong ties to Russian President Vladimir Putin, which he has denied.

- Other Russian billionaires have already been the subject of European Union sanctions where their assets have been frozen. The United Kingdom government is yet to sanction Abramovich.

- Billionaire Hansjorg Wyss had told Swiss newspaper Blick he had been offered the chance to buy the west London club.

- Wyss said Abramovich wanted "to get rid of Chelsea quickly" after the threat of sanctions was raised in Parliament.

Chelsea: Roman Abramovich says he plans to sell club: https://www.bbc.co.uk/sport/football/60585081