Turkmenistan agreed Wednesday to supply natural gas to Pakistan and India in deals that offer major economic benefits but depend on building and defending a US-backed pipeline across Afghanistan. The route, particularly the 735-km (450-mile) leg through the Afghan provinces of Herat and Kandahar, will need billions of dollars in funding. Turkmenistan's state gas company Turkmengaz signed gas sales and purchase agreements with Pakistan's Inter State Gas Systems and Indian state-run utility GAIL. “The implementation of this project will give a powerful impetus to the social and economic development of all the participant countries,” Turkmen Deputy Prime Minister Baimurad Hojamukhamedov said before the signing ceremony in Avaza on the Caspian Sea. Turkmen officials have said the 1,735-km (1,085-mile) pipeline could carry 1 trillion cubic meters of gas over a 30-year period, or 33 billion cubic meters a year. India and Pakistan are both hungry for gas supplies and Turkmenistan is keen to free itself from reliance on gas exports to Russia.