The world does not exist only of US-citizens.
https://www.nytimes.com/interactive/202 ... acker.html
This is a summary about what kind of research worldwide regarding a vaccine against covid-19 is now going on.
There are many companies in many countries and of course there will be a lot of people who refuse, but also others who will readily accept a vaccination.
Here in Japan and in South Korea (and Taiwan also I guess) nobody will be forced to accept a vaccination.
In Japan people have to contact a medical doctor and sign up out of themselves. There is always a waiting list of about 2 weeks or so, for flu, pneumonia etc. etc. Most vaccinations are for free or against a small fee. The local insurance will pay a large part of the costs.
Totally there is a population of totally approx. 200 million people in Japan+South Korea+Taiwan. It is impossible to vaccinate everybody at the same time.
The question is more about if those applicants accept the US-made vaccine. Vaccinations are always paid at least partially by the national health insurance (70 percent) and how much it will cost etc.
In Japan there is also local research going on and many Japanese people are interested in a locally produced Covid-19 vaccine. Many Japanese said clearly they will refuse any vaccine imported from China.
Similar objections are also known in Europe. There are European companies trying to find a vaccine and the huge majority of European citizens said already they strongly will refuse any vaccine imported from Russia.
It's not only about the vaccine itself, it is about which company in which country is producing it and how much money they expect in return.