North Korea 'injecting fuel into rocket' "I think the fuel injection will be completed at an appropriate date," Paek Chang-ho, head of the satellite control centre of the Korean Committee of Space Technology, told a group of foreign journalists in the North Korea capital, Pyongyang. He would not comment on when the fuel injection would be complete. "And as for the exact timing of the launch, it will be decided by my superiors," Paek said. South Korea, which remains technically at war with the North after their 1950-53 conflict ended with a truce rather than a peace treaty, warned Pyongyang it would deepen its isolation if it went ahead with the launch. Security sources in Seoul, citing satellite images, have said that North Korea, which walked out of "six-party" disarmament talks three years ago, is also preparing a third nuclear test following the launch, something it did in 2009, and a move bound to trigger further condemnation and isolation. US Secretary of State Hillary Clinton warned that history pointed to "additional provocations" from North Korea after the launch, apparently a reference to a nuclear test. "This launch will give credence to the view that North Korean leaders see improved relations with the outside world as a threat to their system," she told cadets at the US Naval Academy in Annapolis, Maryland. And recent history strongly suggests that additional provocations may follow. She also called on China to do more to ensure regional stability. China, impoverished North Korea's only major ally, on Tuesday reiterated its pleas for calm and said it had "repeatedly expressed its concern and anxiety about the developments," Foreign Ministry spokesman Liu Weimin told a press briefing in Beijing.