S.Korea's Yoon wary of North nuclear test

South Korea's President Yoon Suk-yeol.
South Korea's Yoon Suk-yeol has placed his troops on alert to respond to the North's military moves. -AP

South Korea's President Yoon Suk-yeol has ordered his military to "promptly and sternly" retaliate to any North Korean provocation amid concerns Pyongyang could conduct its first nuclear test in five years.

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