eu (mostly france and uk to be honest) have this notion of going into ukraine, if and only if russia starts taking large amounts of territory. the goal being to stop russia taking all of ukraine, and with that in mind, the west only intends to defend west of the dnipr. everything west won't be contested. odessa the west intend to hold, but not if russia manages to link up with transnistria, because at that point holding odessa becomes untenable.  russia absolutely intends to take odessa though, for historical and strategical reasons. ukraine sealed its fate here by attacking the black sea fleet. long term, russia can't allow ukraine to keep access to the black sea.
Australia