Lets not forget in first hours of 2022 invasion there were numerous hunting squads deployed in Kyiv with explicit orders and training to execute all Ukraine's high command, including Zelensky and all his family, and cause chaos on civilian and military infrastructure. There are numerous videos how those guys failed, were caught and mostly executed since they expected a very different situation on the ground (which is valid even as per Geneva convention, as non-marked combatants behind enemy lines would often face). One of many FSB and GRU's failures.
If we want to talk about terrorism, list of items on russian side is very, very long and new items are added every day. As I said, empty words and all know it. The closer you look at russia these days at all levels the more similarities with nazi Germany you will find. History really keeps repeating itself with sometimes stunning precision.
It wouldn't be a rational act. It would be an emotional act by an irrational dictator.
Does that mean past usage also wasn't rational? Or it was rational in that case, but impossibly can be rational in the future?
Any use is going to lead to at a minimum an equally harmful response.