uh, Checneya was part of the Russian Federation, then they created their own "government" and claimed independence, remember what the US did when certain states tried this around the 1860s.

Also think about what would happen if say Texas, or California said now that they are a separate country, they would quickly be sorrounded by the USN and USMC from the sea, the Army from the land borders and the Air Force and Navy air from above.