South Korea weighs nuclear options as North's threats escalate sharply

South Korean President Yoon Suk-yeol has warned that Seoul may consider developing its own nuclear weapons or requesting the return of U.S. nuclear arms to the peninsula. His comments come as North Korea accelerates its nuclear programme and revises its doctrine to permit preemptive strikes. Public support for a South Korean nuclear arsenal has surged in recent years, reflecting growing unease over regional threats.

North Korean leader Kim Jong-un announced plans last year to mass-produce nuclear-capable missiles and authorised preemptive strikes at the first sign of conflict. The move followed years of escalating provocations, including over ninety ballistic and cruise missile tests in 2023 alone. Kim's rhetoric has grown increasingly aggressive, with threats in early 2026 of inflicting the 'complete collapse' of South Korea.

South Korean public opinion has shifted sharply in response. Polling from 2023 showed 71 percent of citizens backing the idea of a domestic nuclear deterrent—a rise from around 60 percent in previous years. Supporters point to Ukraine's experience, where relinquishing Soviet-era nuclear weapons in exchange for security guarantees failed to prevent Russia's invasion. The war has reinforced fears that reliance on foreign protection may not be enough. President Yoon's stance aligns with his party's long-standing position on nuclear deterrence, a key issue during his 2022 election campaign. While he stressed that Seoul has no immediate plans to build nuclear weapons, he emphasised strengthening ties with Washington as the primary alternative. Analysts note that South Korea's options remain limited in an increasingly volatile region, with China expanding its nuclear capabilities and North Korea's arsenal growing rapidly. The U.S. now faces the challenge of reassuring Seoul while discouraging proliferation. Experts argue that Washington must offer South Korea a stronger voice in alliance decisions to reduce the appeal of an independent nuclear programme.

Yoon's remarks highlight the deepening security dilemma for South Korea. With North Korea's nuclear ambitions advancing and regional tensions rising, Seoul's reliance on U.S. guarantees is under scrutiny. The government's next steps will depend on balancing public pressure, alliance commitments, and the risks of further escalation.