Oooppss, I don't have any research or information related to the default of Russia and the facts behind it but, if Russia defaulted 3 times previously and going to default again 4th time, I don't think so because Russia currently has a lot of Allies and never forget the natural resources Russia is owning, Probably Russia is one of the Richest country in the entire world from the resources point.
This is what I found after a quick Google, I don't know the intention of OP because there is nothing in OP so, leaving it I think now Russia may not default at least in the current situation because Russia is building good relations with the Aisan major countries and more interestingly Russia is developing relations with the Gulf countries on a fast rate.