It isn't? AFAIK the whole decision making apparatus of the military and intelligence services are all there, neatly tucked between civilian stuff like museum etc..
And even if not, that seems just inflammatory and way more easily harnessed for huge propaganda wins for Putin & co, as opposed to suffocating like hitting refineries, airfields or other similarly painful and impactful but also further-from-the-everyday-people’s-minds-and-eyes targets.
In this case, even without fire it would still be good. You’d want to hit the productive parts which would be hard to replace, and not necessarily the easily replaceable fuel tanks. The amount of fuel lost is one hit, while pretty can be replaceable, but if you make that surviving batch of fuel the last batch…