The CIS is not a state with a capitol, but the headquarters of the IO is Minsk, Byelarus'.
Russia, Ukraine, Armenia, Belarus, Moldova, Georgia.
The Commonwealth of Independent States is the book by Abraham Resnick
after the split of the USSR
The commonwealth consists of Russia and other republics of the former USSR. There is no president, but there is an Executive Secretary, who since 2007 and as of late 2010 was Sergei Lebedev of Russia.