It would be a schism in the world's dollar-based monetary order.
Russia has made plain her overriding monetary objective: to do away with the US dollar for all her trade, an ambition she shares with China and their Asian partners. Furthermore, in the short-term the rouble's weakness is undermining the Russian economy by forcing the Central Bank of Russia (CBR) to impose high interest rates to defend the currency and by increasing the burden of foreign currency debt. There is little doubt that one objective of NATO's economic sanctions is to harm the Russian economy by undermining the currency, and this policy is working with the rouble having fallen 30% against the US dollar this year so far with the prospect of further falls to come.
Russia faces the reality that pricing the rouble in US dollars through the foreign exchanges leaves her a certain loser in a currency war against America and her NATO allies. There is a solution which was suggested in a recent paper by John Butler of Atom Capital, and that is for Russia to link the rouble to gold, or more correctly put it on a gold exchange standard*. The proposal at first sight is so left-field that it takes a lateral thinker such as Butler to think of it. Separately, Professor Steve Hanke of John Hopkins University has alternatively proposed that Russia sets up a currency board to stabilise the rouble. Professor Hanke points out that Northern Russia tied the rouble to the British pound with great success in 1918 after the Bolshevik revolution when Britain and other allied nations invaded and briefly controlled the region. What he didn't say is that sterling would most likely have been accepted as a gold substitute in the region at that time, so running a currency board was the equivalent of putting the rouble in Russia's occupied lands onto a gold exchange standard.