"Resolutions 1695 and 1718 have already been adopted by the UN Security Council, and we believe they are quite sufficient," spokesman Andrei Nesterenko said.
"Tightening sanctions could have the opposite effect and inflict irreparable damage to the six-party talks, isolate and embitter North Korea even more, and provoke it to take inappropriate and retaliatory measures," he said.
North Korea on Sunday launched a multistage rocket that it said was carrying a communications satellite, defying pressure from the United States, Japan, South Korea and other countries, which suspect the launch was a cover for a test of a Taepodong-2 long-range missile.
The 15-member Security Council convened for an emergency meeting late on Sunday at Japan's request, but strong opposition from Russia and China prevented the adoption of even a preliminary statement condemning the launch.
Russian Foreign Minister Sergei Lavrov said Wednesday that Moscow was concerned by Pyongyang's recent rocket launch, but believes that imposing sanctions against North Korea would be counterproductive.