I have no idea what the border is of the new annexed territory. And it looks like a good defensible consolidation to me. Any Uke attack has to start with a crossing of one of the largest rivers in Europe against a defended opposite bank, shipping down the Dnieper is only by agreement or east back forces can sink it. And the water supply to Crimea remains safe in Russian hands....
Where do you think that is incorrect?
“I have no idea what the border is of the new annexed territory.”
It includes the Kherson Oblast, which Russia is bailing on half of it, including its capitol.
That works both ways, though. Kherson is (mostly) on high ground, a retaking of it by Russia, or taking of anything to the west, looks highly improbable barring a VERY costly effort by Russia.
Moreover, the highway and railway that lead SW to Crimea and the highway coming from the NE to the SE bank will be in easy range of Ukie artillery, leaving just one highway from SE Ukraine to Crimea. So, Russia’s forces are in a more defendable position against a massive attack, and they can shell Kherson heavily if they choose (at least for a while), but, their logistics may get picked to pieces over time, esp. if Ukraine gets more HIMARS and some deliveries of M777-ER or equivalent, or even more drones, for that matter.