Putin needs to take Odessa and cut Ukraine off from the Black Sea entirely for this.
Putin is “resting” in his Valdai deep freezer right now propped up next to the frozen sturgeon.
Geography makes this unlikely: there are too many north-south rivers east of Odessa. Plus they can barely advance 200 meters in Aavdivka, and Ukraine counterattacks and makes similar gains elsewhere. Putin is running through his reserves and equipment.