In April 2015 the Financial Times published this letter.
Sir,
The outline of an agreement to restrict and impose constraints on the expansion of Iran’s nuclear capability for between ten and fifteen years has been greeted with dismay by some hard-line Americans. They would prefer that making weapons-grade uranium and plutonium was stopped completely and permanently, and existing stocks removed. This is impossible to sell to the Iranian regime and does not take into account the reality of the situation; namely that a change in government in Iran would potentially derail any agreement. A time limit of between ten and fifteen years reflects this realpolitik and any more stringent and “permanent” agreement would not be the better and more permanent solution that Israel for one would, ideally, like to see. The important point is whether this deal can be adhered to for even ten years and rigorous monitoring may make this limited ambition possible.
Yours faithfully,
Christopher Bellew
Nothing much has changed except the change of government in the US poses a greater threat than the Iranian government.