BEIJING (Reuters) - U.S. Secretary of State Condoleezza Rice wrapped up her Asian tour to rally support for sanctions against North Korea after winning few commitments from governments in the region on how they will be implemented.

After three days of diplomacy in Tokyo, Seoul and Beijing, Rice seemed no nearer to coaxing North Korea back to six-party talks after its October 9 nuclear test sparked international condemnation and led to U.N. economic and weapons sanctions.

While Rice was in Seoul, trying to convince South Korea it was safe under the U.S. "nuclear umbrella," China launched its own diplomatic push by sending a special envoy to Pyongyang to try to break the deadlock and prevent another nuclear test.

After meeting China"s envoy Rice declined to comment in detail on his mission but her tone was not optimistic and she complained the North Koreans were still being belligerent.

She made clear throughout her trip the North Koreans had to be serious if they wanted to resume negotiations that bring together the Koreas, Japan, the United States, China and Russia.

The goal of Rice"s trip to Asia and Russia, where she will meet President Vladimir Putin on Saturday, is to try to maintain a united front and show North Korea the world will not tolerate another nuclear test.

She also wanted to convince Asian nations in particular of the importance of fully implementing U.N. sanctions, voted on unanimously last week.

China said it would meet its U.N. obligations but did not say how. It fears interdictions on the high seas will exacerbate the crisis and provoke North Korea into stronger action.

Rice said she had been assured China would be "scrupulous" in inspecting North Korean cargo on its border, but would wait and see. "Let"s just watch what the Chinese do," she told reporters on Friday.

In South Korea, Rice failed to convince the government to abandon two projects in the north which the United States says are providing cash to the North Korean government.

South Korean Foreign Minister Ban Ki-moon said only that his government would review them and see whether they were in accordance with the U.N. resolution.

Japan, the strongest Asian ally of the United States over North Korea, said there should be "steady implementation" of the U.N. resolution but that various points needed to be finalized when it came to inspecting cargo.

(Additional reporting by Jack Kim in Seoul)