From what I see, these are the "tit" part of the "tit for tat" strategy. Neither Ukraine, nor Iran targeted these in the beginning, however when other side started to escalate, both replied by attacking more critical infrastructure for the other party.
Ukraine has been at war for 4 years. They didn’t have the capability to hit Russia this hard and deep until fairly recently. These are mostly home grown weapons developed during the war.
I heard from friends that a lot Ukraine's large distribution centers were also hit lately after Ukraine hit Russia's.
I haven't seen any site I frequent mention this once. The PR bubble is very real.
I seem to recall that this is optimal game theoretic strategy - don't initiate, but always immediately retaliate.
Whatever is happening now is payback for Putin's birthday present to himself from 2 days ago, firing a missile into a Ukrainian apartment building that killed 22 civilians (mostly women & children).