South Korea is moving to cut launch-related payment due to its Russian partner by around US$4.2 million to reflect the two failed launches of the Naro-1 rocket, an official source said Thursday.Cho Gwang-rae, head of Korea Aerospace Research Institute\'s (KARI) Naro rocket launch team said Seoul has decided to \"retain\" 2 percent of the $210 million it agreed to give Russia\'s Khrunichev State Research and Production Space Center.