But what does "win" mean here? Ukraine clearly is not going to displace Russia, but they can presumably make Russia's occupation expensive and net-negative for several more years at a fraction of their current attrition rate, unless they're forced to the table.
And this seems like a functional loss for Russia. The Eastern provinces Russia holds aren't that valuable in any objective sense. Crimea provides an extremely valuable Black Sea port, but only if Russia can safely keep warships there -- which Russia currently is not able to do. Russia has certainly proven that if they rebuild their entire economy around the goal of holding these assets they can, indeed defend them indefinitely. But they haven't demonstrated that this is worthwhile or sustainable without a very generous peace deal from Ukraine.
And this seems like a functional loss for Russia. The Eastern provinces Russia holds aren't that valuable in any objective sense. Crimea provides an extremely valuable Black Sea port, but only if Russia can safely keep warships there -- which Russia currently is not able to do. Russia has certainly proven that if they rebuild their entire economy around the goal of holding these assets they can, indeed defend them indefinitely. But they haven't demonstrated that this is worthwhile or sustainable without a very generous peace deal from Ukraine.