China, the world's second-largest economy with a huge appetite for energy, has already formed a diversified energy import structure, said Chen.

Wang with Sublime China Information said the pipeline natural gas imports account for about half of the country's total imports. "We have good relationship with countries in Central Asia which are increasing the gas supply to China," she said.

China-Russia gas deal set to be signed

China imports more natural gas in 2013

In 2013, China imported 24.7 billion cu m of natural gas from Turkmenistan which accounted for 46.48 percent of China's total imports.

As a natural gas-rich country, Turkmenistan plans to add an additional 30 billion cu m to China in the future.

Chinese companies have been working to increase supply. They sought acquisition of gas fields and cooperation with local companies in overseas markets, including Turkmenistan, Kazakhstan and Canada.

In 2013, Russia exported about 160 billion cu m of natural gas to Europe, accounting for 30 percent of the European Union's total gas imports.

Half of this supply was delivered through pipelines in Ukraine.

"As a country whose economy is highly dependent on energy exports, Russia's high dependency on a single regional buyer is not safe," said Wang.

According to Reuters, Gazprom dragged Russian stock indexes lower on Tuesday after a spokesman for President Putin told the press about the lack of a supply deal. Gazprom and Russian stock indexes rose in the past days on hopes of a deal during Putin's visit to China.