<Li> 22 June: North Korea requests more food aid from the South during ministerial talks in Seoul, the first for a year . </Li> <Li> 9 July: North Korea says it will rejoin nuclear talks, as US Secretary of State Condoleezza Rice begins a tour of the region . </Li> <Li> 12 July: South Korea offers the North huge amounts of electricity as an incentive to end its nuclear weapons programme . </Li> <Li> 25 July: Fourth round of six - nation talks begins in Beijing . </Li>

When did north korea start testing nuclear weapons