I am a Ukrainian citizen. I have bought a ticket to Shanghai (through Xiamen).

I will fly to Shanghai on 26/02, stay in Xiamen for 9 hrs (layover) and fly to Shanghai (arrival still 26/02). In Shanghai I will stay one day and fly back to Saigon on 27/02. Do I need the entry permit?

I read that the airports adhere to the 72-hour and 144-hour rule, so hope I did not make a mistake.

Thank you in advance for the answer.