Us President Barack Obama has once again stressed the need to enforce existing sanctions on Iran over its nuclear energy program. Obama has repeated his anti-Iran remarks during a joint press conference with visiting French President Francois Hollande in Washington. He says the U-S and France both insist on the sanctions even as they know this would endanger the possibility of a diplomatic solution. He says the U-S has recently intensified its measures to identify and punish individuals and companies that violate the existing anti-Iran sanctions. Obama went further to threaten that sanctions may be tightened if the talks between Iran and the P5+1 group fail. The French president\'s visit to the U-S follows the visit to Iran of a French business delegation which sparked criticism from Washington. Show Less >>