“So what exactly is the revenge for doing to Russia what Russia has been doing to Ukraine since the start of the war?”
Well, since Ukraine is still fighting, there are targets left to hit. Obviously, to any sentient person, (and you are not), Putin is saying that he will retaliate in a more extreme measure with more destructive weaponry.
You are such a repulsive bonehead.
He says it all the time and all he does is bomb more schools or apartment buildings or shopping malls or critical infrastructure, the same terrorism against the civilian population since day one.
And YOU are repulsive for not acknowledging that fact, but instead gloating that this time, like all times, finally, seriously, the Ukrainians are gonna get it for the crime of [insert something Russia has already done].