VIENNA 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 for the second time.
The move appeared to be an attempt by North Korea to show it was serious about a nuclear moratorium deal with the United States last month, an accord which has been thrown into doubt by Pyongyang's announcement on Friday of a planned rocket launch.
The International Atomic Energy Agency, a Vienna-based U.N. body tasked with preventing the spread of nuclear weapons in the world, said it received the invitation on March 16 but declined to give details regarding its content.
"We will discuss with the DPRK (North Korea) and other parties concerned for the details of the visit," IAEA spokeswoman Gill Tudor said in an e-mailed statement.
"Details will be discussed. Nothing has been decided yet."
In Washington, the State Department said that in principle it supported all efforts by the IAEA to gain access to North Korea to monitor Pyongyang's implementation of all aspects of the February 29 nuclear agreement.
However, commenting on Japanese media reports before the IAEA's official announcement, it repeated that it believed this deal had been undercut by the North Korean announcement last week of the planned satellite launch.
Under the February accord, Washington agreed to supply the North with food in exchange for a suspension of nuclear tests, missile launches and uranium enrichment and to allow IAEA inspectors back into the country.
But Pyongyang's announcement - on same day the IAEA received its invitation - that it will launch a rocket carrying a satellite to mark the centenary of founder Kim Il-sung's birth next month drew swift international condemnation.
The United States has 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.
"Obviously there's benefit for any access that the IAEA can get," State Department spokeswoman Victoria Nuland said on Monday. "But it doesn't change the fact that we would consider a satellite launch a violation not only of their U.N. obligations but of the commitments they made to us."
South Korea 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.
Japan's Kyodo news agency on Monday quoted a senior North Korean official as saying North Korea had asked the IAEA to send inspectors to monitor the moratorium of its uranium enrichment programme.
But a Vienna-based Western diplomat told Reuters that North Korea had "offered to meet with the IAEA to discuss the moratorium, they didn't actually offer the IAEA moratorium monitoring at this point."
The secretive North has twice tested a nuclear device, but experts doubt whether it yet has the ability to miniaturize an atomic bomb to place atop a warhead.
Pyongyang is believed to have enough fissile material to make up to a dozen nuclear bombs, and in 2010 unveiled a uranium enrichment facility to go with its plutonium programme which opened a second route to making an atomic weapon.
It is unclear how much scope for inspections the IAEA will get. The North has limited their access during two previous periods when it allowed inspectors in.
North Korea expelled the IAEA a decade ago when a 1994 deal between Pyongyang and Washington unraveled.
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.
Analysts say North Korea may simply continue covert atomic activity elsewhere. Members of a U.N. expert panel said last year that the secretive state most likely had several more undisclosed enrichment-related facilities.
(Additional reporting by Andrew Quinn in Washington; Editing by Karolina Tagaris)