Do you believe there is a chance bigger than 0.0 for Russia to go to war against the US over Iran? Let's be serious.
If, by any chance, Israel were to attack Iran (and I don’t think that’s a realistic option at all), I’m sure Iran wouldn’t be left without the help of its allies, and I mean China and Russia in the first place. Although Iran is under sanctions, China and Russia have no reason to enforce those sanctions, when they themselves are victims of something similar.
Iran and China have quietly drafted a sweeping economic and security partnership that would clear the way for billions of dollars of Chinese investments in energy and other sectors, undercutting the Trump administration’s efforts to isolate the Iranian government because of its nuclear and military ambitions.
The partnership, detailed in an 18-page proposed agreement obtained by The New York Times, would vastly expand Chinese presence in banking, telecommunications, ports, railways and dozens of other projects. In exchange, China would receive a regular — and, according to an Iranian official and an oil trader, heavily discounted — supply of Iranian oil over the next 25 years.
If, in any case, a war occurs, it will all depend on whether it is of a local character or whether large military forces are actively involved in it. The US considers Israel one of its greatest allies and will always defend its interests, but I do not believe that they will ever take part in an open war against Iran - because when they go to war, they choose much weaker opponents.
The only ones who profit from wars are arms manufacturers and distributors, so if someone really thinks there will be a war in the future, don't worry too much about cryptocurrencies or gold - if nuclear bombs start to fly through the air, nothing will matter.