Chechnya is a region of Russia and always has been, how can Russia invade itself? And let's say Chechnya is some kind of independent country that Russia really

Chechnya is a region of Russia and always has been, how can Russia invade itself? And let's say Chechnya is some kind of independent country that Russia really invaded, in 1994. So you had been born before 1994 and only recall three US invasions since then???