Apparently Russia is close to finishing a cauldron around Ukranian/Azov forces in the Donbass region (Izyum).
Which made me wonder...
Considering Russia's negotiation offers (which are now the same as before the war), and the progress being made regarding these negotiations, could it be that Zelinsky is treating that "cauldroned Azov" as an opportunity to get rid of the most radical and nefarious part of Ukraine's political apparatus? Not only by getting rid of the "not neo-nazis don't say that word it hurts my feelings" among the armed forces, but also exposing those within more local positions (mayors, and such).
It seems, at least to me, that Putin does not want Zelinsky dead or he would have been killed long ago. Unless Putin's plan was to capture Zelinsky and have him face a tribunal for whatever reason, but Zelinsky is no Saddam or Gadaffi, and the idea is grotesque to begin with.
Sending assassins is equally grotesque, in addition to being theatrically cliché. But also risky, not necessarily efficient and/or guaranteed in term of accomplishment.
Precision strike then? Russia has a fair amount of precision vectors, and Russia has demonstrated it can strike more or less anywhere in Ukraine with reasonable accuracy. I suppose Zelinsky does not reside at one place for too long and is constantly moved from one place to another, it may also be possible that the Cold War facilities built in case of nuclear war are still there and functional; but in the end their locations are known.
Zelinsky appears to be a rather charismatic leader in the eyes of his people, and now the world. With lots of media focus, lots of media attention, but also lots of appearances and "PR stunts" (for lack of a better term) impromptus.
Depriving Ukraine and the coalition behind Ukraine of that leading figure would have serious and catastrophic impacts on the morale. Removing Zelinsky would create a vacuum, but who would fill it? Poroshenko? Yanukovich? Not sure anybody would want them in a position of power in that specific time of crisis.