Normally. This is not a normal situation though. A future russian government will likely have to offer something to rebuild trust and make the western nations comfortable with dropping the sanctions. Making a radical break with the current system, including dropping commitments seems like it could be expected.
That is, if Russia survives this as a state. There was already a map floating around on social media of Russia's various (semi-)autonomous provinces that could use this opportunity to lobby for independence.
(Disclaimer: not a geostrategist)
