BBC:

He told NBC he believed Israel had not yet decided how to deal with the issue, amid reports that Israel may strike Iran as early as spring.
Mr Obama said the aim was to resolve the crisis diplomatically, but added that no option was off the table.
The US and Israel suspect that Iran is building a nuclear bomb. Iran says its programmes are for peaceful purposes.
Last November, the UN nuclear watchdog, the IAEA, said it had information suggesting Iran had carried out tests "relevant to the development of a nuclear explosive device".
Since then, the US and the EU have imposed a series of sanctions against Iran, including measures targeting the country's lucrative oil industry.
'Deep alarm'
"I've been very clear - we're going to do everything we can to prevent Iran from getting a nuclear weapon and creating a nuclear arms race in a volatile region," Mr Obama told NBC in a live interview on Sunday.