To get a visa for China, you currently need to be inoculated with a Chinese vaccine. Which is of course not possible for almost any 'Western' nation. For some reason, they haven't greenlighted other vaccines yet.
Meanwhile, Bahrein has decided to offer Pfizer/BioNTech for third shots after two Sinopharm vaccinations. I think that the mRNA vaccines are clearly the future.
WSJ News Exclusive | Bahrain, Facing a Covid Surge, Starts Giving Pfizer Boosters to Recipients of Chinese Vaccine
Residents who are over 50, are obese or have chronic illnesses now are being urged to get another shot six months after their full Sinopharm vaccination—with the Pfizer-BioNTech shot.www.wsj.com
Same as most other western countries. The European Medicine Agency is still yet to approve the SInopharm/Sinovac shots, which is still currently under review, meaning currently non-EU citizens can't travel to the bloc unless they are immunized by an EMA-approved vaccine.
COVID-19 vaccines: authorised | European Medicines Agency (europa.eu)
Same case for Pfizer/Moderna vaccines in China. In fact: "Pfizer-BioNTech shot is likely to be approved mid-year."
When It Comes to a Travel Restart All Vaccines Are Not Equal (msn.com)