The International Atomic Energy Agency, the UN's nuclear watchdog, is poised to publish a new report on Iran's nuclear programme.
The BBC's Bethany Bell, in Vienna, has examined the IAEA's latest quarterly report on Iran's nuclear programme.
BBC: UN nuclear agency IAEA: Iran 'studying nuclear weapons'
UN, EU and US sanctions targeting Iran's nuclear programme exempt trade in medicine for humanitarian reasons.
Other issues expected on the summit agenda included global warming, security and Iran's nuclear programme.
The leaders also discussed the war in Afghanistan and Iran's nuclear programme during the phone call.
He is also pressing Israel not to try to destroy Iran's nuclear programme by bombing it.
ECONOMIST: Obama, Iran and North Korea: Meeting thuggery with coolness | The
Mr Peres dismissed as "nonsense" speculation that Israel was planning to attack Iran over its nuclear programme.
But can it be soon enough to ease growing anxiety over Iran's nuclear programme and stave off more crippling sanctions?
Shortly afterwards the vote on sanctions against Iran over its nuclear programme set another test for Vietnam's diplomacy.
President Obama even made a light-hearted reference to Mr Netanyahu's warning of a "red line" with Iran's nuclear programme.
When it comes to Iran's nuclear programme, however, outside worries are more warranted.
Our correspondent says Mr Netanyahu came to Washington with his own list of priorities, topped by Iran's nuclear programme.
French energy company Total says it has stopped petrol deliveries to Iran, amid growing international pressure over Iran's nuclear programme.
Iran insists its nuclear programme is peaceful while Israel and the West accuse it of trying to make nuclear weapons.
And it dispatched a high-ranking State Department official, William Burns, to participate in multilateral talks with Iran over its nuclear programme.
In terms of foreign policy, he has asked the world to draw "a clear red line" over Iran's nuclear programme.
This week's Turkish vote in the UN Security Council against sanctions on Iran for its nuclear programme has reinforced this view.
Like many Western governments, the Gulf monarchies remain concerned that Iran's nuclear programme is oddly shaped for civilian-only purposes (see article).
Meanwhile the European Union's top foreign policy official said on Thursday she believed that negotiations on Iran's nuclear programme would resume shortly.
The rial has reportedly lost more than 80% of its value since 2011 because of US-led trade sanctions over Iran's nuclear programme.
Iran says its nuclear programme is solely to generate civilian power.
BBC: UN nuclear agency IAEA: Iran 'studying nuclear weapons'
Also likely to be on the agenda are the security situation in north Africa, Iran's nuclear programme and the continuing uprising in Syria.
Such areas include the Middle East peace process, dealing with Iran's nuclear programme and promoting reform among the EU's southern and eastern neighbours.
Nothing Mr ElBaradei's men say looks able yet to dispel the cloud of Iranian secrecy and Western suspicion that hovers over Iran's nuclear programme.
The talks are expected to focus on the Middle East, the stand-off over Iran's nuclear programme, North Korea's missile tests, energy security and the Balkans.
What will be the final shape of Iran's nuclear programme and the scale of sanctions if it halts some of its most sensitive nuclear work?
The London talks were also the first chance for G8 ministers to discuss face-to-face the failure of last week's meeting in Almaty, Kazakhstan, on curbing Iran's nuclear programme.
But one of the most contentious issues is Iran's nuclear programme.
On the issue of Iran, though, Mr Lapid has expressed strong support for Mr Netanyahu, who has repeatedly warned of the danger of Iran's nuclear programme.
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