One of the many justifications Vladimir Putin has offered for Russia’s invasion of Ukraine is that NATO’s post-Cold War eastward advance threatens Russia’s national security. But if he hoped his assault on Ukraine would push the transatlantic alliance onto the back foot, Finland and Sweden are about to disappoint him. Both are preparing to join NATO in coming months, instantly doubling the length of the border that separates Russia from the largest and most successful military alliance in history. Many Americans may be surprised to learn that Russia’s large Nordic neighbors weren’t already members. Before and during World War II, Finland fought two wars with the Soviet Union that ended in stalemate. That allowed Finland to keep its independence in exchange for a pledge to remain neutral in the Cold War battle between East and West. For its part, Sweden has safeguarded neutrality as a central pillar of its foreign policy for 200 years. After Soviet collapse, the two countries joined the European Union, but neither felt an urgent need to sign up for a post-Cold War military alliance whose continuing purpose was unclear. Russia’s 2014 seizure of Crimea persuaded both countries to build cooperation with NATO, but there was…
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