SEOUL, Dec. 6 (Xinhua) -- U.S. Vice President Joseph Biden said on Friday it is necessary to improve cooperation among U.S. Asian allies and get right relationship with China.

Delivering a speech at South Korea's Yonsei University after meeting with South Korean president Park Geun-hye, Biden added the U.S. is devoting to promoting cooperation rather than competition with China.

All U.S. Asian allies, especially Japan and South Korea, along with the U.S. should be able to improve relationship and cooperation with one another and try to get relationship with China right in order to fight against the emerging challenges like maritime security, non-proliferation in this region, Biden noted.

"We are committed to sustain a positive, cooperative U.S.- Chinese relationship," said Biden. "It is not only in our interest, it is in the interests of the region and the world."

Biden reaffirmed U.S. Asia-rebalancing strategy, saying the U.S. commitment to its strategic shift to Asia never changes, including economy, diplomacy and others.

Biden said he and Park agreed to promote close cooperation among Seoul, Tokyo and Washington, although ties between South Korea and Japan has been strained over disputed islands and wartime sex slaves.

He also urged all the countries involved in the East and South China Sea dispute to reduce the risk of conflicts and avoid possibilities of miscalculation.

Meanwhile, Biden reconfirmed that the U.S. will not accept and tolerate a nuclear-armed Democratic People's Republic of Korea ( DPRK).

He said the U.S. is prepared to go back to the six-party talks when the DPRK demonstrates its full commitment to complete, verifiable and irreversible denuclearization.

Biden arrived in Seoul on Thursday night on the last leg of his tour to Japan, China and South Korea. He will then pay a visit to the Demilitarized Zone (DMZ) on Saturday, wrapping up his tour to the three Asian countries.