I've been following Nadin Brzezinski. She's been following all sorts of Russian website for and against the war. She's been reporting all sorts of sabotage and other signs of internal strife in Russia. There are other commentators.

If half of their stories are true, then there are big problem ahead for Russia.

There are many more signs than there were a year ago of citizen disassatistfaction. Whether there's enough to topple Putin is another matter. But it is plausible.

History says regime changes (or civil war) happens quite quickly, with holders of power seemingly strong days before the change. But there are always signs beforehand the change could happen.