The Mission of Sweden to NATO shared the update on Twitter on May 18.
The Swedish ambassador to NATO Vernhoff Axel and his Finnish counterpart, Klaus Korhonen delivered membership applications, signed by their countries' foreign ministers, to NATO Secretary General Jens Stoltenberg.
"A historic day! Today, Sweden and Finland hand in letters expressing their countries’ interest to apply for NATO membership to SG JensStoltenberg," the Mission of Sweden to NATO tweeted.
Both countries decided to abandon formal neutral status after the full-scale Russian military aggression against Ukraine started.
On May 17, the Swedish Foreign Minister Ann Linde signed her country's application to NATO. On the same day the Finnish Parliament approved their decision on joining the Alliance.
The NATO Council will consider these applications, after which all 30 Member States will ratify membership agreements.