Mr. Putin is already planning for victory. His latest so-called peace proposal — in which Russia keeps occupied territory and Ukraine is banned from joining NATO — was dismissed as propaganda by many Western leaders. But it is, in fact, the most realistic scenario for how this war will pan out.
Obviously you can’t use official Russian government statements as evidence of Russia’s intent, because that would be Russian propaganda. The only authoritative reputable sources for Russia’s intent are privately owned US media outlets citing anonymous US state department officials.