All 276 lawmakers present voted in favor of Finland’s bid, days after Hungary’s parliament also endorsed Helsinki’s accession.
Alarmed by Russia’s invasion of Ukraine a year ago, Finland and Sweden abandoned their decades-long policy of nonalignment and applied to join the alliance.
Full unanimity is required to admit new members into the 30-member alliance, and Turkey and Hungary were the last two NATO members to ratify Finland’s accession.
Sweden’s bid to join the alliance, meanwhile, has been left hanging, with both Turkey and Hungary holding out on giving it the green light despite expressing support for NATO’s expansion.