An AIDS vaccine already exists. It's known as not having unprotected sex with a person whom you are not sure is free of disease.
Interesting wording.
I thought monkeys were nominally immune to "HIV"; they are susceptible to "SIV". Therefore, if a monkey is injected with AIDS virus and nothing happens, that's normal even without the vaccine.
If a monkey can be expected to get AIDS if injected with HIV, and a monkey is injected with HIV, and gets AIDS, then that, too, is "not abnormal".
Thank you, Bill Clinton, for the lessons in parsing speech.
Consider that western researchers have to find "at risk" populations and then observe them for years after administrating the vaccine to determine it's effectiveness. Chinese researchers on the other hand can just take a prisoner and administer the vaccine and then inject them with HIV to quickly and directly test the effectiveness of that vaccine.