Bipartisan Senate bill aims to cement U.S. nuclear deterrence for South Korea and allies

Senators Mark Kelly (D-AZ) and Thom Tillis (R-NC) have unveiled the Reaffirming Extended Nuclear Deterrence Act, a bipartisan effort to restate that U.S. extended deterrence guarantees to treaty allies remain "ironclad." The bill outlines a strategy that combines a robust nuclear arsenal with conventional capabilities, regular joint exercises and ongoing strategic consultations. It specifically names South Korea, Japan, Australia and NATO members as partners whose security aligns with U.S. national interests, while warning of expanding nuclear forces in North Korea, China and Russia.

Lawmakers argue that clear deterrence has discouraged allies from developing independent nuclear weapons. The legislation also responds to the senators' call for the Trump administration to restore reduced joint military drills with South Korea. If enacted, the act would formalize continued U.S. defense investments and coordination with these partners.