Earlier quoted context omitted.
The entire invasion is illogical. There was arguably some sense to Crimea - there is no sense in this invasion.
My knowledge of Russian bureaucrats comes mostly from watching Chernobyl on HBO, but I wouldn't be surprised if it isn't simply that Putin said he wanted Ukraine and nobody at the top could push back.
And, as an aside, I think COVID started for the exact same reason as what's portrayed in Chernobyl. Chinese model of governance is not that different. When accurate sober assessments of facts on the ground are needed and speed is of the essence, its ineffectiveness takes over. Once the genie is out of the bottle and there's nothing to hide from superiors, and once Beijing sends over some adults to whip things into shape, the sheer scale of China's economy allows it to power through and suppress the crisis using draconian means. But for the first who knows how many weeks (certainly well before Jan 1 2020), it was much slower motion Chernobyl.