Sweden has officially become NATO's 32nd member after a nearly two-year-long process, sparking diverse reactions.

Critical voices, including Swedish Peace and International Women's Federation for Peace and Freedom (IKFF), as well as political figures from the Left Party and the Green Party, have expressed opposition to the membership.

The historic move was marked by a series of official events, including a visit by Prime Minister Ulf Kristersson and Foreign Minister Tobias Billström to Washington, leading to Sweden's formal invitation to join the alliance.

The country is now part of a military defense alliance that promises mutual defense under Article 5, committing to support any member state under attack.

Sweden's NATO membership comes with expectations of continued military buildup to meet the alliance's defense spending goals.