NIOC Managing Director Ali Kardor and Alexey Miller signed the documents in Tehran on Wednesday.

One of the deals concerns a gas cooperation roadmap between NIOC and Gazprom and the other is about cooperation for construction if Iran LNG project with partnership of Iran's Oil Industry Persian Fund.

Head of the Oil Industry Persian Fund Nosrat Rahimi was the signatory of the second document.

Gazprom is the world's biggest producer of natural gas and one of the largest companies of the globe.

The company is the supplier of over 25% of Europe's gas needs.