South Korea is pouring resources into its strategy of deterring any North Korean nuclear attack by preparing for preemptive strikes if necessary, a strategy some experts say may exacerbate their arms race and risks miscalculation during a conflict.

South Korean President Yoon Suk-yeol, who took office in May, has publicly given new emphasis to the so-called Kill Chain system to counter a North Korean nuclear attack.

First developed a decade ago as North Korea ramped up its nuclear development, Kill Chain calls for preemptive strikes against the North's missiles and possibly its senior leadership if an imminent attack is detected.