On May 18, 2022, Sweden and Finland formally announced their wish to join NATO. This wish to give up decades of military neutrality quickly developed after Putin’s Russia attacked Ukraine on February 24th, 2022, leaving large parts of Ukraine in ruins. But we can’t be sure whether Sweden and Finland will actually be accepted into NATO since Turkey has already announced that it plans on vetoing the accession of the two Nordic countries. What exactly NATO is, why the Swedes and Finns have recently changed their views on it, and why Erdogan does not want them to join will all be discussed in this article.