To summarize: 1) Ukraine is bracing for a Russian offensive by fortifying the entire front; 2) that scenario could be averted, however, by freezing the conflict; 3) but Zelensky refuses to do so due to his messianic delusions of victory despite sobering up a bit lately; 4) A Russian breakthrough could prompt NATO to directly intervene in Ukraine out of desperation to stop it if the front collapses; but 5) since this entails great risks, the US hopes that the secret Zaluzhny-Gerasimov talks will freeze the conflict first.
Does Russia NEED to have a breakthrough to end this war on their terms? Or can they afford to just hold on to their own positions and wait for the Ukrainian Army to collapse?
Those are honest questions. I think you would have a better chance of accurately answering them better than I.