Breakthrough or stalemate?

摘要

In a striking shift of policy, the American administration this week said it would join direct talks with Iran-provided that the ruling mullahs once more suspend their enrichment of uranium. As The Economist went to press, the five permanent members of the un Security Council, plus Germany, were meeting in Vienna to put final touches to a new set of proposals meant to persuade Iran to desist from its suspected plan to build a nuclear bomb.