Secrets, sources and methods? Antidotes? A lotion that would regrow Putin's hair? Who knows? Nuland didn't say and Rubio didn't ask. You're theorizing in advance of the facts again.

And that's the problem with your argument, and the point of all the fact checkers, the UN Security Council, and the US Government. There's no evidence and all your questions don't change that. If you had any evidence, you would be giving us answers. To put it bluntly, you can JAQ, but you don't know jack.
That's no surprise, you're just a guy in rural Canada. But give this some thought: Russia is a major power with intelligence agencies good enough to steal secrets from the US, Urkaine is 17 percent ethnic Russian, and they can't get evidence of what the Ukrainian government is doing at what Nuland called their biological research facilities?
I don't know, but I know this. Russia made the claim, the burden of proof is on them and so far, bubkes!