The puppet government will need support from military/Russia police, control of cities, transport links and so on. Look how quickly the US-backed Afghan govern

The puppet government will need support from military/Russia police, control of cities, transport links and so on. Look how quickly the US-backed Afghan government fell when US troops retreated. Another sad possibility is that Russia just wants to cause as much death, havoc and destruction, then retreat. But that seems a lot less like an achievement.