Who said I wanted to go - other than you?
All I said was they have a 15% flat tax.
While Russia being a petrostate manages to fill state coffins through oil revenue it is not quite as rosy as you seem to think. Currently Russia has 13% income tax, but on top of that there is 30% payroll tax. Russia is notoriously bad place for doing business due to their huge corruption.
Just look at the Hermitage Capital Management/Magnitsky case - Russian IRS in cohorts with criminals steal hundreds of millions from an American company. When company lawyer goes to the police to file a complain the thieves themselves are assigned to investigate the case, lawyer is thrown in jail where he is held without a court for almost a year (1 year is maximum to be held without a court in Russia) and dies under suspicious circumstances just few days before the year is up. Through some miracle the personal fortune of families of investigators grows by $50 million after that.
13% AFAIK