BEIJING - America's top military officer on July 10 urged Beijing to  use its relationship with Pyongyang to ensure regional stability, while  warning North Korea against further dangerous provocations.

 Adm. Mike Mullen,   chairman of the U.S. Joint Chiefs of Staff, attends the Cooperative  Security and Regional Stability in Asia meeting at Renmin University in  Beijing on July 10.   (STR / AFP via Getty Images) 
Adm.  Mike Mullen, chairman of the U.S. Joint Chiefs of Staff, stressed that  Washington was in no way seeking to contain China's dramatic rise, but  that the U.S. would remain active in the Asia Pacific region for a long  time.
"North Korea and the leadership of North Korea is only  predictable in one sense and that is - if you base it historically -  they will continue to provocate," Mullen told reporters after arriving  in Beijing.
"The provocations I think now are potentially more dangerous than they have been in the past."
Tensions  in Northeast Asia have risen sharply since South Korea accused the  North of torpedoing a warship in March 2010, killing 46 sailors.
Pyongyang  angrily denied the charge but went on to shell a border island in  November, killing four South Koreans including two civilians.
Six-party  nuclear disarmament talks, grouping the two Koreas, China, Japan,  Russia and the United States, have been stalled since the North  abandoned them in April 2009. It staged its second nuclear test a month  later.
"All of us are focused on a stable outcome here of what is  increasingly a difficult challenge with respect to the leadership in  North Korea and what it might do," Mullen said.
"The Chinese  leadership, they have a strong relationship with the leadership in  Pyongyang and they exercise that routinely ... continuing to do that as  they have done in the past is really important."
On a four-day  trip to China, Mullen said he would discuss that and other issues in  talks with his counterpart Gen. Chen Bingde and while visiting military  bases as the two nations seek to bolster their security cooperation.
"The  United States is deepening its commitment to this region and the  alliances and partnerships that define our presence there," Mullen said  in a speech at Beijing's Renmin University.
"We are, and will remain, a Pacific power, just as China is a Pacific power."
To  help build trust with China, the U.S. will conduct anti-piracy drills  with China in the Gulf of Aden this year, host medical aid exercises and  participate in joint disaster relief exercises next year, he said.
"This  region and the global challenges that we face together are just too  vital and too vast for us to continue to find obstacles to a better  understanding of each other," Mullen told reporters.
The trip  coincided with a joint naval exercise that began July 9 with the U.S.,  Japanese and Australian navies in the South China Sea, where recent  Chinese assertiveness over territorial claims has raised tensions.
During  his trip, the first to China by a U.S. chairman of the joint chiefs  since 2007, Mullen said he would also discuss the Taiwan issue,  stability in the South China Sea and confidence-building measures  between the two nations.
"Containing China is not the case ... we  would like to see China in the long run to be a strong partner with the  United States to resolve some of the issues that we have got both  regionally and globally," Mullen said.
As tensions in the South  China Sea mount, China-U.S. military exchanges have also picked up, with  the former US Defense Secretary Robert Gates meeting Chinese Defense  Minister Liang Guanglie in Singapore in June.
Gates also visited Beijing in January.
Gates  warned last month that clashes could erupt in the South China Sea  unless nations adopt a mechanism to settle their territorial disputes  peacefully.
Mullen dismissed suggestions that wars in Afghanistan,  Iraq and Libya had left the U.S. military unable to play a strong role  in the Pacific, describing the idea of America in decline as "just dead  wrong."