At this year's G7 Hiroshima Summit, one topic leaders will discuss is nuclear disarmament and non-proliferation. But with Russia's nuclear threats in the conflict with Ukraine, North Korea's ballistic missile tests, and China's increasing nuclear arsenal, these goals have become challenging to achieve. How can we rein in proliferation and create global cooperation toward nuclear disarmament at this critical time? Former Deputy Secretary General of NATO, Rose Gottemoeller offers her insights.