Russia is indeed retreating from the Kiev front, not because of some genius strategy, but because they failed to achieve their initial goals, lost a ton of mate

Russia is indeed retreating from the Kiev front, not because of some genius strategy, but because they failed to achieve their initial goals, lost a ton of material and troops, and now they need to regroup those troops which were attacking Kyiv to reinforce the ones in the east and south to try to achieve their new more limited goals - occupying the whole Donbass and southern Ukraine.