We have no idea what Russia actually wanted or expected, we just have Russian statements and speculation from western talking heads speculating about that.

My speculation was that Russia wanted a repeat of their intervention in the South Ossetia war. A show of force, including a rapid drive on the capital, followed by a favorable peace deal. This peace deal would probably include an end to the Donbas war, Crimean water rights, and massive demilitarization of Ukraine. Ukraine may have had to recognize the Donbas republics. The peace talks were in Turkey and it looks like Boris Johnson came in and scuttled them.