If Putin's Russian Army were more competent than their Ukrainian results have shown, there would be considerable risk in the inclusion of Finland into NATO. Hundreds of miles of border with Russia. While Stalin failed to conquer Finland in 1940, that country was ruled by Tzarist Russia for a century before 1918 and by Sweden before that. A more competent and better equipped Russian Army under a more effective leader would pose a serious risk to Scandinavia, Poland, and the Baltic States.
NATO members will have to sharply increase military spending, at the expense of domestic programs, to restrain a post-Putin Russia. That country has zero experience with democracy, passing from absolute monarchy to Communism to strongman rule. There is no reason to believe there will be real change in Moscow.