North Korean leader Kim Jong Un on Monday said that his military should “thoroughly annihilate” the United States and South Korea if provoked, after he promised to boost national defence, including by launching three more spy satellites and building nuclear weapons in 2024, as part of “overwhelming” war readiness to cope with US-led confrontational moves.North Korean leader Kim Jong Un on Monday said that his military should “thoroughly annihilate” the United States and South Korea if provoked, after he promised to boost national defence, including by launching three more spy satellites and building nuclear weapons in 2024, as part of “overwhelming” war readiness to cope with US-led confrontational moves.