14-month break. The two-day meetings were led by EU High Representative Catherine Ashton and Iran's chief nuclear negotiator Saeed Jalili. The talks deadlocked after Iran imposed two preconditions: recognition of Iran's right to enrich uranium and dropping the United Nations economic sanctions on Tehran. April 2012 Istanbul meeting The first session of fresh negotiations in April went well, with delegates praising the constructive dialogue and Iran's positive attitude. Israeli Prime Minister Binyamin Netanyahu said, however, that Iran had been given a "freebie", a charge that was sharply rebutted by Barack Obama. In the lead up to the second round of negotiations in May, and in what may foreshadow a significant concession, an unnamed senior US official hinted the United States might accept Iran enriching uranium to five percent so long as the Iranians agreed to tough international oversight of the process. The US shift was reportedly made for the pragmatic reason that unconditional demands for zero enrichment would make it impossible to reach a negotiated deal. Netanyahu had insisted a few days before that he would tolerate no enrichment, not even to the three percent required for nuclear power. In a shift on the Iranian side, April saw members of the Iranian Islamic Revolutionary Guard Corps urging Ayatollah Ali Khamenei to maintain a policy of keeping uranium enrichment at or below 20 percent. The EU's High Representative for Foreign Affairs Catherine Ashton felt compelled to make a special visit to Netanyahu, partly to keep him from again voicing his negativity and opposition to the negotiations. At the meeting, which included Avigdor Lieberman, Ehud Barak and Shaul Mofaz, the Israelis demanded a guaranteed timetable for cessation of all uranium enrichment by Iran, the removal of all enriched uranium, and the dismantlement of the underground facility at Fordo. Otherwise, they said, Iran would use the talks to buy time. May 2012 Baghdad negotiations Second enrichment plant On 21 September 2009, Iran informed the IAEA that it was constructing a second enrichment facility. The following day (22 September) IAEA Director General ElBaradei informed the United States, and two days later (24 September) the United States, United Kingdom and France briefed the IAEA on an enrichment facility under construction at an underground location at Fordow, north of Qom. On 25 September, at the G-20 Summit, the three countries criticized Iran for once again concealing a nuclear facility from the IAEA. The United States said