A few kilometres away from the North Korean border, the South Korean town of Paju shows little sign of the recent tensions that have risen in the militarised region.
The test will be the first of the Terminal High Altitude Area Defense (THAAD) to defend against a simulated attack by an intermediate-range ballistic missile.
South Korea's President Moon Jae-in seeks to calm tensions in the Korean Peninsula as the Trump administration vows to increase pressure on Pyongyang over its nuclear programme.
Chinese Foreign Minister Wang Yi said missile tests by the DPRK and US-South Korea military drills were causing regional tensions to escalate like "accelerating trains coming toward each other."
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