ASTANA. 30.03.2010. KAZINFORM /Kanat Kulshmanov/ "Kazakhstan may increase oil supply to Slovakia twofold this year", Kazakh President N.Nazarbayev has said today at the press conference. "The oil supplies from Kazakhstan to Slovakia were up to 3 mln tons last year. We have an opportunity to supply two times more this year", N.Nazarbayev said. The Head of the State also noted that within the negotiations held in Astana the sides agreed on cooperation in the field of engineering, energy, transit, military-technical sector, agriculture, education and healthcare.