Two more countries have joined in the trend started by China and Japan recently, where they bypass the dollar and instead use their own currencies directly in trading. Iran and Russia have made a trade agreement on January 7th which moves the stakes ever closer to the end of the US's reign as the reserve currency.
The battle over Iran is indeed taking on more than simply a nuclear threat option. It is pitting economies vs economies, and superpowers vs superpowers in a chess match for supremacy. As the West overleverages itself on devalued dollars, the resource rich nations are willing to move away from the reserve and petro-dollar currencies, and towards a new paradigm for trade.