NATO leaders meeting in Madrid issued a formal invitation to Finland and Sweden to become members, after Russia’s invasion of Ukraine prompted the two to end decades of military non-alignment and seek accession... Joining NATO marks a significant shift for both countries. Sweden would end more than 200 years of non-alignment, while Finland, which shares an 810 mile border with Russia, would end a policy of neutrality adopted as a Soviet-imposed condition of peace following World War Two. The process to finalize now requires ratification by all 30 current allies. That could take months, but the alliance stressed that “the...