And he described a recent letter sent to him by US President Barack Obama as "positive and constructive".
Iran is under UN and Western sanctions over its controversial nuclear programme. It says it is enriching uranium for peaceful purposes but the US and its allies suspect Iran`s leaders of trying to built a nuclear weapon.
In an extract released ahead of the interview`s full broadcast, the Iranian president says: "It could be subtle and tiny steps for a very important future."
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