This one should be pretty self-evident, showing the extent of land-grabbing in Ukraine that Vladimir Putin may in theory have found desirable when he invaded Crimea and before he'd even imagine serious Ukrainian resistance against the separatists which he undeniably supports. It's not just the Black Sea Fleat or the fear that Western rockets may one day stand in Donbass, it's also Transnistria (and by extension Abkhazia, South Ossetia and whatever in frozen conflicts by Russia exist in the first place) where the Homo Sovietus is actually the closest to a real thing in the world and whose denizens so desperately want to become Russians. Calling Novorossiya the "Black Sea Federal District" is actually the closest thing to a neutral name for it being larger than Crimea but without resorting to the Novorossiya term.
In reality, of course, Ukraine fights these Pro-Russian insurrections and Novorossiya may be too costly to be worth it even without fighting. And the Ukraine isn't Little Russia anymore, but the Ukraine, goddamn it.