Iran, which has long resisted international monitoring efforts and built clandestine nuclear facilities, agreed to stop enriching uranium beyond 5 percent, a level that would be sufficient for energy production but that would require further enrichment for bomb-making. To make good on that pledge, Iran will dismantle links between networks of centrifuges.
Its stockpile of uranium enriched to 20 percent, a short hop from weapons-grade fuel, would be diluted or converted into oxide so that it could not be readily used for military purposes. Iran agreed that it would not install any new centrifuges, start up any that are not already operating or build new enrichment facilities.
The agreement, however, does not require Iran to stop enriching uranium to a low level of 3.5 percent, or to dismantle any of its existing centrifuges…
The United States did not accept Iran’s claim that it had a “right to enrich” under the nuclear non-proliferation treaty. But American officials signaled last week that they were open to a compromise in which the two sides would essentially agree to disagree on how the proliferation treaty should be interpreted, while Tehran continued to enrich.