South Korea will develop new multi-billion-dollar missile interceptor systems to better counter North Korea’s evolving arsenal of nuclear-capable and ballistic projectiles, Seoul announced on Tuesday.

The Defense Acquisition Program Administration (DAPA) said Seoul has approved over $4 billion in spending for the new systems starting next year, which include long-range surface-to-air missiles (L-SAM II) and mid-range surface-to-air missiles (M-SAM) Block-III system.

The new L-SAM II will be utilized as “a high-altitude interceptor with a defense scope three-times bigger than [the earlier model of] L-SAM,” DAPA said in a press release. L-SAM II, if developed according to plan, will become the