The Soviet Union was union of states. For its dissolution to be illegal, it had to break a law - which law was it?

The citizens of many of the unionized states where very much in favour of separation, and still are to this day. Are you really trying to say that nations were kicked out of the union against their will?

Illegally?

You forgot that it can run without ssh set up, by installing ansible on the machines and letting them poll for changes.