Chinese port operator Shandong Port Group closed its ports (Qingdao Port as the leader and Rizhao Port and Yantai Port etc.) to tankers of the Russian shadow fleet, which are under US and EU sanctions.

https://www.reuters.com/business/energy/chinas-shandong-port-group-blacklists-us-sanctioned-oil-vessels-say-traders-2025-01-07/