Key to bringing Israel on board is a promise by the US to adopt a much tougher line with Iran over its alleged nuclear weapons programme. The US, along with Britain and France, is planning to push the United Nations security council to expand sanctions to include Iran’s oil and gas industry, a move that could cripple its economy.

In return, the Israeli government will be expected to agree to a partial freeze on the construction of settlements in the Middle East. In the words of one official close to the negotiations: “The message is: Iran is an existential threat to Israel; settlements are not.”…

Although the negotiations are being held in private, they have reached such an advanced stage that both France and Russia have approached the US offering to host a peace conference.