You've made several formal logical fallacies here.
First, "silence" is NOT an admission of guilt. This is a big mistake far too many people make (most notably regarding our justice system.)
Secondly, just because Fauci is the leading virologist and spoke on behalf of NIH during the coronavirus crisis, does not mean he is privy to investments in foreign countries and their health systems.
Third, your entire position is based completely on confirmation bias. You've come to a conclusion, without any evidence to back it up. Instead, you are reaching for evidence to shape towards your conclusion.
Russia has constantly been lying to the entire world ever since at least before their invasion to take Crimea. They said that's all they wanted. They lied about not invading Ukraine when they were massing their armies on it's border. They lied to their own people that they weren't going to war. They lied about Nazis being in leadership positions in Ukraine. Nothing but lies. Not a very good track record there.
You also have made several logical fallacies here.
1. Putting words in my mouth. I never said Fauci's silence is an admission of guilt.
What I am saying is we have had non denial denials, a massive red flag to any interrogator and when you look at what people are saying it is just as informative to see what they are not saying.
2. There is no logical conclusion that Fauci would be in a position to make this denial, it is simply a fact based on what we have heard Fauci say under oath as well as what we know about his position in the government bureaucracy.
3. Since I have not made any conclusions this point is absurd. What I have said is that I have not seen any forceful denial of Russia's allegations. Instead I have seen official confirmations of the substance of their claims both in writing and spoken under oath, I have seen "non denial denials", I have seen the absence of people speaking, and I have seen a whole lot of evidence that the US government is involved in these crimes. I have also seen many lies told over the last two years to try and distract people from these lies.
Yes, Russia has lied in the past. That is in fact the only response that I have seen the US give in response to the allegations. If Russia was fully isolated on the world stage and the only one pushing this then maybe that would be sufficient. But China, India, a couple of African nations and Brazil all came out publicly during the hearing and said we need to investigate these allegations. That means the US must respond to the substance of the allegations and they have not done so and that lack is starting to scream out, like Abel's blood.