I don't think Zhelensky has lost his mojo. I think his generals have got something planned for this spring and are simply waiting for the weather.

Thinking about the personalities of Putin and Zhelensky: as well as being a KGB man, Putin is a judoka. What do you not do if you're fighting a judoka? You don't get into a bloody wrestling match.

Meanwhile Zhelensky is a comedian, but it must be hard to keep giggling while your country and its cities are being comprehensively trashed. However if I were him, I'd quietly mass some crack troops on the other side of Ukraine and send them into Russia on a big raid. Get in fast, wreck as much military stuff as noisily as you can, if possible wreck Putin's various palaces and any sentimental places too, and bugger off faster. Take pictures.

Then when Putin retaliates, ambush him.