The trilateral Iran-Russia-Azerbaijan cooperation document plays an important role in expanding relations, Iranian First Vice President Mohammad Mokhber said at a meeting with Azerbaijani Prime Minister Ali Asadov, Mehr reported.

According to him, there are ample opportunities for expansion of bilateral relations in the field of transport and Tehran is determined to strengthen cooperation with Baku.

He noted that expansion of preferential trade aimed at increasing the volume of bilateral trade is one of the IRI's strategies and called on Iran and Azerbaijan to use the existing opportunities to further expand trade.

The First Vice President said that the Islamic Republic of Iran considers Azerbaijan a 'brother' and is ready to expand comprehensive cooperation with Baku. He also noted that the borders of Iran's neighbors are red lines, and Tehran will not accept threats to these borders.