Iran has begun enriching uranium deep inside a mountain and sentenced an American to death for spying, angering the West and undermining hopes that diplomacy could avert further sanctions or war. The start of enrichment at the Fordow bunker near the Shi'ite Muslim holy city of Qom was confirmed on Monday by an Iranian official in Tehran and by the Vienna-based International Atomic Energy Agency. Iran says its nuclear program is purely non-military but the West believes it is designed to produce nuclear weapons. The Islamic Republic's decision to carry out enrichment work deep underground could eventually make it much...