Japan and India signed a joint document Thursday in Tokyo to promote comprehensive cooperation between the two countries in the energy sector, Japanese officials said.

The document was signed between Economy, Trade and Industry Minister Shoichi Nakagawa and Indian Petroleum and Natural Gas Minister Mani Shankar Aiyar, the officials said.

The signing marks Japan's first comprehensive energy cooperation pact with another country, they said.

Under the pact, Japan and India aim to establish cooperative relations in new energies, including hydrogen, in addition to oil and natural gas, the officials said.

Japan will provide its energy-saving technologies to India, where future energy demand is expected to overtake China's and become the world's biggest, they said.