Bilateral cooperation in the oil and gas sphere was one of the topics of the talks held by the National Leader of the Turkmen people, Chairman of the Halk Maslahaty of Turkmenistan Gurbanguly Berdimuhamedov during his working visit to the Islamic Republic of Iran on May 30-31. The fuel and energy sector is a strategic one for the national economies of both countries, the development of which both Turkmenistan and the Islamic Republic of Iran pay priority attention to.