For years, President Vladimir V. Putin has viewed the expansion of NATO as an existential threat that would leave Russia hemmed in with Western missiles on its doorstep. Now, Moscow’s invasion of Ukraine seems to be bringing the Russian leader’s nightmare to life, with NATO on the brink of starting its largest potential expansion in nearly two decades.
After navigating the postwar era in nonalignment and neutrality, Sweden and Finland are now actively exploring ascension to the military…