If you want someone tried at the ICC, you need them to be captured, held and transported to The Hague. Really whichever ruler it is also needs to be from a country that is a signatory to those conventions. It’s all a bit meaningless though. Let’s say you captured Putin and put him on trial for war crimes in Ukraine- then he got a good lawyer and there was some technicality where he “got off” (I don’t know the rules of ICC trials). But would it really matter? I hardly imagine anyone would think “oh well he had a full and fair trial”. Everyone would just think “that’s utter horseshit he’s obviously guilty and needs to be punished”. Also the only way it’s happening is if the Russian military has already been defeated, in which case Putin has already probably fallen backwards out of a 10 storey high window after accidentally forcing his way through the metal bars after accidentally drinking a very hot cup of Polonium infused tea.
To get worked up about “war crimes” is largely meaningless. We hope that militaries conduct themselves within limits and don’t use things like rape and torture, but if a military does rape and torture it’s way through an enemy population, the only way it’s getting punished is when it’s been defeated, in which case a large portion of the military has already been killed. And who wants to pay the cost of imprisoning the soldiers of say, the Russian federation? It would cost an absolute fortune and be largely impractical. There’s a reason most of those found guilty at the Nuremberg trials were executed.
What is happening in Gaza isn’t really about war crimes, or not. The fact of the matter is there will be no push to try and capture and try those members of Hamas who were involved in the planning or execution of the October 7 raid, nor will there be any interest in extracting any of the Israeli leadership for their reaction. At the end of this, either the Hamas structure will be eradicated or not. If they are, then that will be the end of it until IJ, MB or some other group starts attacking.
On the Israeli side, realistically once this conflict is over I would expect Netenyahu to lose his premiership. He’s known as a political survivor, so maybe he will, I’m not that well versed in Israeli domestic politics but I think that being the Premier of an intelligence failure on that level is not something you’re likely to recover from.