“ Russia approved the vaccine after trying it on several dozen subjects in a non-blind study and ahead of Phase 3 trials, which are key to establish its safety and efficacy, drawing skepticism from the international community and accusations it could have jumped the gun for political gains.”
It's not clear what you are quoting, but there are vaccines besides the russian one. For example there is also the Chinese CoronaVac.
I think there are completely reasonable reasons for people to consider these vaccines as well. Some have larger phase III trials, and some are tested in different demographics. for example, Arabs might be more comfortable with trials that were run with predominantly arab participants.