The long-awaited return of a jointSearch and Rescue Exercise(SAREX) between the Republic of Korea (ROK) Navy and the Japanese Maritime Self-Defense Force in the East China Sea was confirmed earlier this month.
After nine years, the exercise on June 7 represented an important change in the security framework in the region and a sign of improved relations between two of its leading powers.
Since taking office in June 2025, South Korean President Lee Jae Myung has been re-evaluating the country’s foreign policy and approach to defense cooperation. He has advocated for apragmatic approachto foreign policy, with decision-making informed by a rigorous assessment of the strategic environment. That assessment reflects the reality of a security environment that continues to deteriorate.
The persistent threat posed by North Korea continues to shape South Korea’s strategic calculations, particularly as Pyongyang advances its nuclear capabilities. North Korea has already conducted six nuclear tests and is developing a diverse range of weapons of mass destruction, from intercontinental ballistic missiles capable of reaching the entire U.S. mainland to short-range ballistic missiles capable of flying at low altitude on irregular trajectories.
On June 8, just a day after the ROK-Japan search and rescue exercise, Chinese President Xi Jinping traveled to Pyongyang for a two-daysummitwith North Korean leader Kim Jong-un in a sign of growing ties between the two countries.
Coverage of the summit in North Korean and Chinese media notablyfailedto mention calls for the country’s denuclearization. This has largely been read as a diplomaticwinfor Pyongyang, and a step backwards from the meeting between Xi and U.S. President Donald Trump and President in May this year where the leaders reiterated a commitment to the denuclearization of North Korea.
Pyongyang’s growing military ties with Russia also pose challenges for Seoul's regional security, elevating the risk that North Korea may acquire sophisticated military technology, which it could deploy against either South Korea or the U.S.
Under Lee, South Korea has also been undertaking a strategicresettowards its relationship with China, engaging in back-to-back meetings with Xi in November 2025 and January 2026. Lee has executed a diplomaticbalancingact, avoiding discussion of contentious issues including Taiwan and North Korea with China, whilst simultaneously seeking to strengthen its military and economic relationship with the United States.
For the last two decades, China has been South Korea’s largest trading partner. Now, Lee is seeking to address this vulnerability and reduce the country’s exposure to China. South Korea is particularly sensitive to concerns around China’s use ofeconomic coercion, which have had considerable economic impact on South Korea in the past.
But this balancing act between two superpowers will inevitably have limitations. These constraints are becoming increasingly visible as South Korea manages anunpredictableUnited States which has suggested that it may reduce its overseas military presence and demand greater defense commitments from its allies.
Source: Korea Times News
