Sweden became NATO’s newest member on Thursday (7 March 2024), upon depositing its instrument of accession to the North Atlantic Treaty with the Government of the United States in Washington DC. With Sweden’s accession, NATO now counts 32 countries among its members.
Where?
Baltic Sea
Swedish article, but I guess you know how to translate: https://www.svt.se/nyheter/inrikes/rysk-atomubat-med-kapacitet-for-24-karnvapenrobotar-ovade-i-ostersjon