

There was no Russification of ethnic minorities in the Soviet Union. A broader soviet identity was propped up alongside a careful consideration for preserving national identity. The Soviets did try to minimize religion, although they still allowed religious freedom, they tried to promote atheism as it is backed by a dialectical materialist understanding of the world as well as modern science. This, however, often backfired as trying to combat religion as a means to help support feudalism often ended up creating bigger backlash, so this was wound back. Either way, the soviets were invited into Afghanistan by the legitimate government.
As for Xinjiang, no, Uyghur peoples are not being murdered by the state. Rather than anecdotes that may not even exist (it’s only your word, after all), I recommend Xinjiang: A Report and Resource Compilation. Reality does not stack up to your narrative, nor your hermeneutics of suspicion towards the naming of Xinjiang.

Nope, the Soviets were invited into Afghanistan by the Democratic Republic of Afghanistan, the legitimate government at the time, to fight the CIA-backed factions. As for Xinjiang, no, Uyghurs are not being killed nor is Uyghur culture being erased. You can watch videos disproving your claims very easily online.