The United Nations was established in 1945 to replace the weaker League of Nations. It aims to promote international cooperation and prevent conflicts. Over the years, the UN has undertaken peacekeeping missions, overseen elections and helped draft international agreements on issues like climate change and human rights. However, it has also faced challenges when major powers bypass or oppose its decisions, as seen in Somalia, Yugoslavia and Iraq. More recently, the UN General Assembly condemned Russia's invasion of Ukraine and called for its withdrawal.