UK Security Adviser Saw Promise in Iran Nuclear Talks, Prevented War

In a significant development, the Guardian can reveal that Jonathan Powell, the United Kingdom's national security adviser, attended the final talks between the US and Iran, and judged that the offer made by Tehran on its nuclear program was substantial enough to prevent a rush to war.

According to sources, Powell believed that meaningful progress had been made in the negotiations held in Geneva, and that the deal proposed by Iran was