Iranian President Hassan Rouhani said it was possible to turn more than three decades of enmity with the United States into friendship if both sides made an effort.
He was speaking in a Swiss television interview on Wednesday after arriving at the World Economic Forum in Davos where he will court the global business community and meet a series of oil company executives on Thursday.
Asked whether there could one day be a US embassy again in Tehran instead of the Swiss embassy representing US interests in Iran, the president told public RTS television:
"No animosity lasts eternally, no friendship either lasts eternally. So we have to transform animosities into friendship."
Iran is negotiating with the United States as part of a "constructive engagement" with the world community and is seeking actions from Washington to back up its words, said President Hassan Rouhani.
No animosity lasts eternally, no friendship either lasts eternally. So we have to transform animosities into friendship.
An interim deal with six major powers including the United States to restrict Iran's disputed nuclear programme in exchange for a partial easing of economic sanctions entered into force this week.
Rouhani travelled to Davos to persuade foreign investors to return to his country, which has some of the world's biggest oil and gas resources and a market of 76 million people.
In the interview, in which he spoke in Farsi voiced over into French, he said relations with Washington had been difficult in the past but with hard work and efforts by both sides, problems could be overcome.
"This effort is necessary to create confidence on both sides. Iran is in fact stretching out its hand in peace and friendship to all countries of the world and wants friendly, good relations with all countries in the world," the president said.
Rouhani will give a short speech on Thursday to chief executives from oil majors such as Eni, BP, Total and Shell, according to several executives who meet in Davos.
Heads of US companies such as Exxon Mobil could also attend, the executives said.
Tehran wants Western oil companies to revive its giant ageing oilfields and develop new oil and gas fields once sanctions are lifted and is improving its oil investment contract in order to lure them in.
Encouraged by the preliminary nuclear deal struck between Iran and Western powers in November, Tehran and Big Oil have wasted no time making contact, in the hope of a full lifting of sanctions.