U.N. nuclear watchdog says receives North Korea invitation VIENNA (Reuters) - The United Nations nuclear watchdog said on Monday it had received an invitation from North Korea to visit, three years after its inspectors were expelled from the reclusive Asian state. The International Atomic Energy Agency, a Vienna-based U.N. body, said it received the invitation on March 16 and it would discuss the details of the visit with North Korea and "other parties concerned." "Nothing has been decided yet," IAEA spokeswoman Gill Tudor said, without giving details. North Korea and the United States announced a deal last month, under which Washington agreed to supply the North with food in exchange for a suspension of nuclear tests, missile launches and uranium enrichment and to allow international inspectors into the country. But that accord has been thrown into doubt by Pyongyang's announcement on Friday - the same day the IAEA said it received its invitation - that it will launch a long-range rocket carrying a "working" satellite to mark the centenary of founder Kim Il-sung's birth next month. The United States said the North's plan to launch a satellite could violate its February nuclear moratorium agreement and scuttle the resumption of U.S. food aid. South Korea on Monday condemned rival North Korea's planned rocket launch as a "grave provocation," saying it was a disguised attempt to develop a long-range ballistic missile capable of delivering nuclear weapons. It threw the organization out again in April 2009 after rejecting the intrusive inspections provided for under a 2005 aid deal with five regional powers that allowed the U.N. watchdog to return. IAEA Director General Yukiya Amano earlier this month said the U.N. agency was preparing for a possible return to North Korea, but was not yet in direct contact with Pyongyang. Reporting by Fredrik Dahl; Editing by Karolina Tagaris