But while Finland managed to become the 31st member of NATO on April 4, Sweden's bid still faces opposition.
New members need to be unanimously ratified by all members of the alliance, and Sweden still faces opposition from Ankara and Budapest.
Sweden has especially angered Türkiye by refusing to extradite dozens of suspects that President Recep Tayyip Erdoğan links to a failed 2016 coup attempt and decades-long terrorism in the country.
The Nordic nation has had close ties with NATO ever since joining the Partnership for Peace programme in the 1990s, but as a non-member, it is not covered by the security guarantees of NATO's Article 5 on collective defence.