LukOil-Western Siberia, a 100% subsidiary of Russian oil giant LukOil, plans to invest around $300 million to develop the Bolshekhetskaya fields in the Yamalo-Nenetsky autonomous region next year.   Most of the investment will be on preparing infrastructure for the Nakhodkinskoye gas field project, said a LukOil statement. Construction of the field’s startÐup complex will…