Alright, let's roll with that logic: A sovereign government that violates the sovereignty of it's citizens is illegitimate. Since Ukraine is now violating the sovereignty of it's citizens for wartime mobilization, it is an illegitimate government. That's a sound premise, actually. In a vacuum this would be true.

However, that completely loses the nuance that Ukraine is not the aggressor in this "senseless war". Ukraine did not violate it's citizen's sovereignty, RUSSIA DID by initiating the war of annexation against the sovereign government of Ukraine. By violating the sovereignty of the government, Russia thus violated the sovereignty of every citizen under that government. None of this would have been necessary had the initial aggression not been committed.
So, now extend your argument: Let's go ahead and accuse Ukraine of violating human rights with this expansion of power. You must also do so for Russia, who backed Ukraine into this corner in the first place, and who is also committing infinitely worse violations against the civilian territory they have thus far annexed. Are you willing to do that? Because so far, you haven't.

You seem to be echoing a large number of Russian propaganda points trying to paint Ukraine as some fascist shithole, and not the independent nation being overrun by a expansionist dictatorship that it is. This argument is not in good faith.