I see two reasons for Russia to accept a cease fire : they are happy with what they took and want to keep it, so a cease fire is better because there is no treaty to give back anything ; or they want a bit of time to rebuild their supply of ammo and equipment before they go back at it.

The first one would be if the US continue to support Ukraine. It would make it like the west is now supporting the war while Russia is asking for peace (totally hypocritical of course). Russia could stand on its positions and solidify them if it's accepted. If Ukraine continue the war, it'll be Ukraine on the offensive, which is a harder position.

The second one would be if Ukraine loses US support and ask for a cease fire after the dombass is fully taken. Russia wouldn't be armed to take it to rebuild it's supply before going again. The risk here would be that nato or UN send forces in Ukraine, and if Europe take this time to increase its weapon production too, but those are unlikely on a short term.