Elaborating on the recent visit of Erdogan to Iran, Yardim said the visit resulted in bringing the views of the two countries in various fields even closer together.
Asked to comment on claims that Erdogan carried a nuclear message from Obama to Iran, the Turkish diplomat denied the news released by the Washington Post.
As regards the two neighboring countries ties, Yardim told the Islamic republic news agency that Tehran-Ankara relations are crucial for both the world and the region, noting that the two countries play major roles in the region.
He further underscored that Turkey expects positive results of the upcoming negotiations between Tehran and the 5+1 in Istanbul.
Iran and the Group 5+1 have eventually accepted to resume their talks in Istanbul, Turkey, on April 14 and in case of good progress hold a second round of talks in Iraq's capital city of Baghdad.
The last meeting between the two sides took place in Istanbul in January 2011. Iran and the G5+1 had also held two rounds of multifaceted talks in Geneva in December 2010.
The Iranian team of negotiators is led by Supreme National Security Council (SNSC) Secretary Saeed Jalili, while delegations of the six world powers are headed by EU foreign policy Chief Catherine Ashton.