The drills could trigger a response from North Korea, which has used previous exercises as a pretext for weapons tests

The 11-day Ulchi Freedom Shield – the second of two large-scale exercises held annually in South Korea, after another set in March – will involve 21,000 soldiers, including 18,000 South Koreans, in computer-simulated command post operations and field training.

The drills, which the allies describe as defensive, could trigger a response from North Korea, which has long portrayed the exercises as invasion rehearsals and has often used them as a pretext for military demonstrations and weapons tests aimed at advancing its nuclear programme.

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