Gaz de France, the owner of Europe’s largest natural-gas network, will be “associated” with the Nabucco pipeline project, Romanian President Traian Basescu said, according to an adviser to French President Nicolas Sarkozy who was traveling with him. The 5-billion-euro ($7.4 billion) project – designed to pump gas from the Caspian via Turkey and the Balkans to Austria through 3,300 km (2,051 miles) of pipelines – is led by a consortium of oil and gas companies in transit countries.