I think, unsurprisingly, there will always be a core of support for Putin's war in Russia.
When this board started, there was still a substantial amount of support for the Iraq war (primarily from Republicans) even years after the excuses given for the need to invade had been debunked.
People don't like their nation to lose wars. American conservatives wanted us to stay in Vietnam and fight on to the elusive final victory.
I think think the war supporters in Russia tend to be older people who are still susceptible to Soviet style propaganda, as well as just conservative and nationalist Russians who at this point just don't want Russia to lose a war, regardless of why it started.
I personally don't know any Russian citizens who support the war, but my aqaintences tend to be the urban professional class.