Pfizer efficiency is 39% according to Israel and Isreal is also demanding people get a 3rd jab, so now their excuse is that it keep people alive and out of hospital. No different from the Chinese inactive vaccines other than it is gene therapy.
That Country with Singapore looking at OP actually think the western vaccines are the best and they are more advance than anything China makes saying 95% this and that until Isreal pop their bubble. That kind of backward thinking is why they still have large covid 19 outbreaks in their country.
Considering what the USA did to N Vietnam during the war doing mass bombings and attacking on Civilians to force them to submit, I don't expect the leadership which was alive in that era to just submit to USA like S Vietnam did.