You must be being deliberately obtuse at this stage. He's not saying the Crimea incursion should have been fought again more. He's saying that allowing the annexation of Crimea to be relatively peacful didn't prevent the subsequent imvasion of Ukraine, and as such, stopping the war now and allowing Russia to keep the gains it has made may lead to a short-term peace, but will likely not prevent another war in the future.
Given Putin's stated wishes, this will only stop if Russia is unable to make such moves (for whatever reason) or states at risk of invasion are defended such that it's strategically stupid for Russia to even try.
