OK, it is not to be militarized. It will be a buffer state. Japan isn’t militarized either yet they have had their national sovereignty for generations. The reality is that Ukraine is losing and will lose. They were never going to win. It’s better to accept that reality and get fewer people killed than waste lives over a hopeless cause.
It's called a puppet state not a buffer. As to they can't win, Ukrainian's don't have to win, they just have to keep killing Russians even during the occupation. Eventually Russians will leave.