March 2017 was an exhilarating time for Beatrice Fihn. The executive director of the International Campaign to Abolish Nuclear Weapons (ICAN) was at the U.N. in New York City for talks with more than 120 countries to negotiate a treaty on banning nuclear weapons. One moment still stands out: Nikki Haley, then U.S. ambassador to the U.N., and a group of diplomats from several NATO countries held a press conference outside the General Assembly to protest the talks.
“It was such a hilarious role reversal,” Fihn tells me when we meet for lunch in New York this fall, referring to all the times nuclear-disarmament activists have been outside the corridors of power. “Now, we were in the driver’s seat.”
Fihn, 40, has been trying to shift these dynamics ever since she took the helm of the Geneva-based ICAN nearly a decade ago. In 2017, the charismatic Swedish lawyer was thrust into the spotlight when she accepted the Nobel Peace Prize for ICAN’s work to draw attention to the humanitarian consequences of nuclear weapons and its efforts to establish the Treaty on the Prohibition of Nuclear Weapons (TPNW). Now ratified by 68 countries, mostly in the Global South, the ban treaty entered into force in January 2021—the first international legally binding agreement to ban nuclear weapons and activities like testing and development.
However, since then, Fihn feels
