As the US and South Korea start their largest ever military exercises, Pyongyang warns of an "all-out offensive". North Korea has pledged a "sacred war of justice for reunification" including a nuclear strike against the United States, saying joint military exercises by Seoul and Washington were being carried out to prepare for an invasion. South Korean and United States troops began large-scale military exercises on Monday in an annual test of their defences against North Korea, which called the drills "nuclear war moves" and threatened to respond with an "all-out offensive". South Korea said the exercises would be the largest ever following North Korea's fourth nuclear test in January and a long-range rocket launch last month that triggered a United Nations Security Council resolution and tough new sanctions. Isolated North Korea has rejected criticism of is nuclear and rocket programmes, even from old ally China, and last week leader Ki
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