If they land that plan - not that I think such a thing is likely - they don't want Crimea. At the moment it's an isolated enclave that Russia's having to expend enormous amounts of effort to operate - I imagine our lords and masters are quite happy for Russia to keep hold of that bad penny until they simply cannot afford it any more, given that the aim of this operation seems to have become the destruction of Russia rather than the preservation of Ukraine and her people.