He also held a working session on Monday with Zarubezhneft one of Russia's largest oil companies and a long-standing strategic partner of the Vietnam National Oil and Gas (PetroVietnam). Dung hailed extensive links between Zarubezhneft and PetroVietnam over the past years, evidenced by the good performance of the Vietsovpetro and Rusvietpetro joint ventures. He has pledged all possible support to investors working in oil and gas, including Zarubezhneft and other Russian companies. He welcomed the signing of inter-governmental agreements on collaboration with Rusvietpetro and Vietsovpetro.