Mr Putin announced this week the vaccine is safe to use, telling a government meeting: "I know that it works quite effectively, forms strong immunity, and I repeat, it has passed all the necessary checks".
"Well, because we have a way of doing things in this country that we care about safety and we care about efficacy", Fauci said.
Start the day smarter. President Putin also said that one of his daughters has taken the vaccine.
They said the participants' levels of neutralising antibodies were 1.9 to 4.6 times higher than those in patients recovering from SARS-CoV-2 infection.
"I should note that two of the six USA vaccines that we've invested in entered the phase three clinical trials weeks ago that the Russian vaccine is now only beginning", he added.
He said that along with foreign partners, Russian Federation was ready to manufacture 500 million doses of vaccine per year in five countries.
Deputy Prime Minister Tatyana Golikova said Russian Federation could start vaccinating doctors as early as this month. Before then, priority will be given to medical workers and teachers.
Although this comparison provides a benchmark for evaluating the vaccine-elicited immune response and the vaccine's potential to provide protection, the researchers believe phase 3 trials are needed to determine the efficacy of BNT162b1.
The president said that one of his daughters had tested the drug on herself.
"It seems our foreign colleagues are sensing the specific competitive advantages of the Russian drug and are trying to express opinions that in our opinion are completely groundless", Health Minister Mikhail Murashko said on Wednesday.
Mr Putin and other officials have insisted the vaccine is safe. The first is called Ad26, which is similar to a COVID-19 vaccine being developed by Johnson&Johnson, and the second is called Ad5, which is similar to a COVID-19 vaccine being developed by CanSino Biologics.
Although Russia has a long history of vaccine creation, its coronavirus efforts have been shrouded in mystery.
Experts have criticised the lack of Phase III trials, with the World Health Organization (WHO) stating it should not be rolled out into the community without completing this stage of development. "Russian science has always been ridiculously secretive". As of 2019, both of those vaccines were listed by the World Health Organization as "candidate vaccines".
Indonesia said Tuesday it would launch a Phase 3 human trial of a vaccine candidate from China's Sinovac Biotech. Have the results of the trials been reviewed by WHO. "The point is to have a vaccine that is safe and effective", Mr Azar said.
"I think the manner the Russians are doing is not really advisable".
If an unproven vaccine were given to large populations in Russia and globally, it could be like playing "Russian roulette".
That is why vaccines must pass rigorous scientific tests. "I'm not particularly afraid the vaccine is going to be a very bad vaccine", he said.