Our panelists discuss the history of the North Atlantic Treaty Organization (NATO), its expansion from twelve to thirty countries, its evolving mission in the post-Cold War world, as well as the alliance’s role and influence in Russia’s invasion of Ukraine. The CFR Young Professionals Briefing Series provides an opportunity for those early in their careers to engage with CFR. The briefings feature remarks by experts on critical global issues and lessons learned in their careers. These events are intended for individuals who have completed their undergraduate studies and have not yet reached the age of thirty to be eligible for CFR term membership.