International Atomic Energy Agency (IAEA) Director General Rafael Mariano Grossi discusses IAEA efforts to address the nuclear safety and security situation in Ukraine, and the main proliferation challenges worldwide, including concerns surrounding Iran’s nuclear program. The Paul C. Warnke Lecture on International Security was established in 2002 and is endowed by a number of Council members and the family and friends of Paul C. Warnke. The lecture commemorates his legacy of courageous service to the nation and international peace.