John Key says he was invited to the US nuclear security summit because Barack Obama recognised the importance of NZ's anti-nuclear position.

It is time that United States Navy ships were allowed to return to New Zealand waters, says Sir Geoffrey Palmer.

A nuclear security summit next week is likely to be the tipping point for a push for global disarmament, writes Audrey Young.

France deliberately exposed 300 of its conscripts to an atomic bomb test in the Sahara in 1961.

Hillary Clinton told Saudi college students that if Iran gets a nuclear weapon it could trigger a nuclear arms race in the Middle East.

Barack Obama has the worst poll rating for any American President since Truman at this stage in the presidency.

US President Barack Obama's recent Nobel Peace Prize has generated much praise as well consternation around the world.

Western intelligence agencies have known about Iran's second uranium enrichment plant, hidden in the mountains west of Qom, since construction began in 2006.

Actor Lucy Lawless helped start a peace march which will circle the world before ending in the Andes in January.

Revelations of co-operation between Myanmar and North Korea on nuclear development rings alarm bells.