North Korea’s strategic arsenal

North Korea says it will continue to co-operate with the United States on ending its nuclear program and agrees that stalled talks need to resume. The country’s foreign ministry said Pyongyang would work with Washington to “narrow remaining differences”. In June, the UN Security Council voted to impose tougher sanctions on communist North Korea, following a nuclear test carried by the North Koreans in defiance of previous UN resolutions.

Iran ‘concealed nuclear facility’

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Iran has been accused of concealing a second uranium enrichment plant in defiance of international calls for transparency over its nuclear plans. The US, UK and France demanded UN inspectors be given immediate access to the facility. Iran revealed the existence of the plant to the UN watchdog, saying it was not yet operational and would only be used for nuclear energy. Tehran has previously acknowledged it has one enrichment plant, at Natanz (pictured in AP photo). Katy Clark reports.

• BBC coverage
• Iran’s key nuclear sites
• Background Brief: Nuclear Standoff with Iran

Nuclear disarmament

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The UN Security Council has unanimously adopted a resolution calling for nuclear disarmament, in a session chaired by President Barack Obama. Many organizations and networks have been campaigning for complete nuclear disarmament for decades. The World’s Jeb Sharp takes a look at these movements and where they are now. Download MP3 (Photo by Keystone/Hulton Archive/Getty Images)

• BBC coverage of today’s UN resolution
• FAQ: Nuclear disarmament

The state of nuclear non-proliferation

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In his first speech before the General Assembly, the President also addressed nuclear non-proliferation and related security issues. The World’s Katy Clark gives us an update on the issue of containing the spread of nuclear weapons. Download MP3

• FAQ nuclear disarmament
• Treaty on the Non-Proliferation of Nuclear Weapons