Umerov and Medinsky met privately one on one for 2.5 hours prior to the full meeting.
Someone posted the full text of the Russian proposal in some thread.
There is a great deal more to it than territory.
The item I most recall was actually a concession. They will accept as part of the agreement a cancellation of any requirement In Either Direction for money to fund damage restoration. They had previously made clear Ukraine would have to pay damages. And I think it was the same paragraph that they mentioned gas transit fees, which had been the norm for decades, to permit Ukraine to collect some transit money for GAZPROM gas flowing to Europe — clearly intended to be a way to help Ukraine pay for repair of damages in Kiev and elsewhere.