The sanctions mean that Chelsea essentially cannot function properly as a club, so with that in mind, the government issued a special license with limited manoeuvrability that allows the club to still fulfil it's fixtures and pay matchday staff in order to host games, but we can't sell tickets, merchandise etc, so only season tickets holders will be allowed in and the megastore, hotels etc will be closed until further notice. A limited amount money will be allowed so Chelsea are still be able to fulfil away fixtures too, travel, hotel stay, food, etc.
The club also can't transfer players in or out, can't renew any contracts, so if the sanctions stay in place until May, Rudiger. for example, would be forced to leave, even if he wanted to stay, because he is out of contract and we are prohibited from giving him a new one.
Then there is issue of selling the club. That is still unclear for me. The government want to seize the club and possibly oversee a sale but that's not possible unless Abramovich agrees to hand over the club. If he fights the sanctions in court, then the club will likely remain in limbo and run the risk of facing football sanctions from the FA for failing to pay player salaries etc.