(VOVworld) – There remain major differences and important choices that need to be made, US Secretary of State John Kerry said Wednesday after a three-day nuclear negotiation with Iranian Foreign Minister Mohammad Javad Zarif.

Secretary of State John Kerry during a break in the negotiations over Iran's nuclear program in Switzerland on Wednesday  (Photo: Jean-Christophe Bott /Keystone, via Associated Press)

Kerry told reporters in Switzerland that he will not let external factors or politics distract him from the ongoing nuclear talks, adding that any deal will include intrusive access and verification measures necessary to confirm that Iran's nuclear facilities are on a peaceful path. Kerry said any deal to hinder Tehran’s nuclear program must be carefully considered on a global scale. Iranian Foreign Minister Mohammad Javad Zarif highlighted differences related to lifting economic sanctions and uranium enrichment at Iran’s Arak reactor.