The leaders are expected to repeat a call from G8 foreign ministers urging North Korea to "fully cooperate" in the verification of its nuclear declaration and settle the issue of the country's past abductions of Japanese nationals.
America now wants more stringent inspection and verification of the North's missile and nuclear programmes, along with reductions in the threat posed by North Korea's armed forces, which are mostly massed along the border with the South.
For the past 18 months AWE has co-operated with non-nuclear Norway and a London-based NGO, the Verification Research, Training and Information Centre (Vertic), on techniques for verifying that when a country promises to cut weapons, it really does.
It includes recommendations on security, verification, transparency, conventional weapons and the legal framework for nuclear disarmament.
Any deal would need to constrain Iran's uranium enrichment and subject it to enhanced verification by the International Atomic Energy Agency, the UN's nuclear watchdog, all the while helping to advance those bits of the programme that are demonstrably non-military in character.
Critically, the second phase would depend on universal acceptance of a comprehensive verification and enforcement system accompanied by tighter controls on fissile materials produced by civil-nuclear programmes.
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At the summit, the United States will sign accords on enhanced verification procedures sought by the Reagan Administration for the Threshold Test Ban Treaty and the Peaceful Nuclear Explosions Treaty of the 1970s as prerequisites to ratification by the U.S. Congress.
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Start made dramatic reductions in nuclear forces of some 80% but the key point at this moment is that it contains binding agreements on verification and when the treaty runs out so do those commitments.
Earlier this year the defence secretary, Des Browne, suggested that representatives from the weapons labs of all five official nuclear powers meet to see if some of the technologies mastered for weapons building could in future be turned to verification tasks.
Even if the Kremlin dropped its historic opposition to limiting these arms in a new accord, verification would be impossible as a practical matter and the price high in terms of further reducing the "nuclear umbrella" U.S. tactical nukes provide our allies.
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