North Korea says its military is ready for a pre-emptive attack against the South. The announcement was made as naval exercises between the US, South Korea, Australia and New Zealand take place. Al Jazeera's Rob Mcbride reports from Pohang, South Korea. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter / ajenglish Find us on Facebook / aljazeera Check our website http://www.aljazeera.com/