Iran, six world powers reach agreement on all key aspects.

LAUSANNE, April 1. /TASS/. Iran and six world powers negotiating in the Swiss city of Lausanne have reached an agreement in principle on all key aspects of a deal on Tehran's nuclear program, Russian Foreign Minister Sergey Lavrov told Russian journalists, adding that further details would be announced in the next few hours or throughout the day.

"Experts will finalise details by the end of June," Lavrov said, noting "quite achievable" results.