What does exactly RU/CIS mean? (in games) that says RU/CIS only

https://en.wikipedia.org/wiki/Commonwealth_of_Independent_States maybe

RU = Russia
CIS = The Commonwealth of Independent States (CIS) formed when the former Soviet Union (now called Russia) totally dissolved in 1991. At its conception it consisted of ten former Soviet Republics: Armenia, Belarus, Kazakhstan, Kyrgyzstan, Moldova, Russia, Tajikistan, Turkmenistan, Ukraine, and Uzbekistan.