Barack Obama singles out Koch brothers over fossil fuel lobbying

Barack Obama has railed against US political and business figures who oppose the expansion of wind and solar power in a speech where he singled out the influential Koch brothers for criticism.

John Kerry acknowledges 'tangible progress' in nuclear talks with Iran

The top diplomats from the US and Iran have hailed the progress made so far at nuclear talks in Vienna but say more time may be needed to close the remaining gaps between the sides.

Iran Nuclear Talks Mired in Details of Enrichment, Arak

Foreign ministers met in Geneva on the fourth day of negotiations over Iran’s nuclear program, which remain mired in the same implacable issues that have prevented the signing of an accord in two previous rounds.

Iran can make nuclear weapons - but won't, says top politician

Iran has the technological capability to produce nuclear weapons but will never do so, a prominent politician in the Islamic republic has said.