The "Federal Air Transport Agency" in question here isn't a military agency, it's a civilian one[1]. For the Americans here it'd be like destroying the infrastructure for the FAA.
Why is a NON-MILITARY BODY the target here? Yes, Russia is committing war crimes in Ukraine and shelling, shooting, and (maybe) kidnapping Ukrainian citizens BUT THAT DOES NOT MEAN that you stoop to their level and also target Russian civilians via these types of attacks.
We saw this retaliatory revenge-driven behavior after Germany invaded Russia in WW2. Germany committed unspeakable acts against the Russian population on their march to Moscow and when the tide turned and Russia reached German territory the Russians did the same thing. Both were disgusting and the result of both was the bloodiest theatre of the war for both the military AND civilians: German and Russian both. Civilians being arbitrarily killed, women raped, and overall people massacred.
What does a random Russian citizen who needs to fly between A and B have to do with Putin's war in Ukraine? Russia is a "democracy" in name-only; it's common knowledge people get disappeared for speaking up in Russia. It's not like they have a choice; so why attack people trapped by the circumstances of the country they were born in?
I should note -- and it annoys me I have to say this because it means the substance of my opinion here is only valid by how "woke" my view on the war is, and not other merits my opinion may or may not have -- I don't support Vladimir Putin's war in Ukraine. I do not supporting the Russian military's killing of Ukrainian civilians and targeting non-military infrastructure, but I also do not support Ukraine's retaliatory attacks on Russian CITIZENS.
I'm not Russian. I'm not Ukrainian. I'm from England, I'm European.
[1] -- https://en.wikipedia.org/wiki/Federal_Air_Transport_Agency (matched based on the name Rosaviatsiya which is mentioned in the article of this thread).