LOL --- no rational person thinks that Ukraine will agree to cut off all their access to the sea -- especially after they have basically thwarted and beaten the Russian invaders at this point making Putin fail at achieving a single one of his military objectives including failing to capture & hold a major city in Ukraine.
For a second, I thought that looked exactly like what I had in mind too.
Except at a quick glance I thought all of the brown area was to be a NATO base.
My bad, I guess. We shall see.
Russia is not "negotiating". There are only surrender terms and the Ukrainians can either accept them or not.