Hàn Quốc từng bước thay thế nghĩa vụ quân sự bắt buộc bằng chế độ tự nguyện

What global readers should know

There is no information in the provided content regarding South Korea transitioning from mandatory military service to a voluntary system. The text focuses on political and military developments in Northeast Asia, such as North Korea's naval expansions and the breakdown of communication between the Koreas. Key events include the commissioning of a North Korean destroyer and the South Korean Prime Minister's call for China to facilitate dialogue with North Korea. These elements contextualize regional security concerns but do not address South Korea's military service policy changes.