This article could be of signifigance.
We will have to monitor events and see how this plays out. The article claims that on April 24th a meeting was held by the Russian government to "find a solution for getting rid of the US Dollar in Russian export operations."
We already knew that the energy deal with China would likely bypass US dollars. However, this is the first report we have seen of an official government meeting to attack using the US dollar.
Here is the full article linked above:
"Russian press reports that the country's Ministry of Finance is ready to greenlight a plan to radically increase the role of the Russian ruble in export operations while reducing the share of dollar-denominated transactions. Governmental sources believe that the Russian banking sector is "ready to handle the increased number of ruble-denominated transactions".