BEIJING (AP) -- U.S. Secretary of State John Kerry on Friday appealed for China's help in bringing a belligerent North Korea back to nuclear disarmament talks but faced an uncertain response as the request was accompanied by demands for Beijing to roll back a series of increasingly aggressive steps it has taken to assert itself in territorial disputes with its smaller neighbors.
Kerry opened a 24-hour visit here by meeting Chinese President Xi Jinping at the Great Hall of the People and was later to see an array other senior officials as he sought to underscore the Obama administration's commitment to refocusing U.S. foreign policy on the Asia-Pacific amid myriad other global priorities. Kerry planned to address issues ranging from climate change to Syria and Iran with his Chinese hosts.
Yet, he faces a decidedly tough sell on both of his main agenda items: North Korea and regional tensions that have flared, particularly with Japan over conflicting maritime claims.
For one, the extent of China's influence, and willingness to use it, with North Korea is unclear following a purge in the isolated country's leadership.
And, China has angrily dismissed U.S criticism over its moves in the East and South China seas that have alarmed U.S. allies like Japan and the Philippines.
In a stridently anti-Japanese editorial appearing Friday, China's official Xinhua News Agency said the U.S. must pressure Tokyo into ceasing its "provocative moves" or risk a regional conflict in the future.
"The United States has to know that, while Beijing has always been trying to address territorial brawls with some neighboring countries through peaceful means, it will not hesitate to take steps to secure its key national security interests according to China's sovereign rights," Xinhua said.
"To dial down the flaring regional tensions, what Washington is expected to do right at the moment is not to blame China but press Japan to call off its provocative moves."
In Seoul, South Korea, on Thursday, Kerry said the Obama administration wants to put new emphasis on getting North Korea back to stalled six-nation talks aimed at getting Pyongyang to give up nuclear weapons.
"Let me be clear," he told reporters. "The United States will not accept North Korea as a nuclear-armed state. We will not accept talks for the sake of talks. And the DPRK must show that it will negotiate and live up to its commitments regarding denuclearization."
Despite that, Kerry struck an upbeat tone in meetings with his Chinese hosts, telling Foreign Minister Wang Yi that the U.S. looked forward to "managing our differences effectively and finding a way to cooperate practically where possible."
Efforts toward that end, he said, would rely heavily on China, North Korea's only friend, putting pressure on Pyongyang.
"China has a unique and critical role that it can play," Kerry said. "No country has a greater potential to influence North Korea's behavior than China, given their extensive trading relationship with the North."
But China's leverage with the North is being tested.
Diplomats say Beijing received no prior warning ahead of the December arrest and execution of North Korean leader Kim Jong Un's uncle, Jang Song Thaek, who had been considered Pyongyang's point man on China affairs and was a strong promoter of free trade zones being set up along their mutual border.
That came on the heels of Pyongyang's snubbing of Beijing's wishes when it conducted a missile test in late 2012, followed by the underground detonation of a nuclear device last spring.
Jang's removal was seen as depriving Beijing of its chief conduit into the North Korean regime and in the weeks that followed the leadership found itself at a loss as to how to proceed. A delegation of Chinese diplomats led by the Foreign Ministry's deputy head of Asian affairs visited Pyongyang last week in a sign that Beijing was attempting to renew dialogue with Kim's government, although it remains to be seen whether the North was any more receptive to China's pleas to return to the nuclear talks.
Those discussions involving the two Koreas, the United States, China, Russia and Japan, broke down at the end of 2008 and U.S. officials say they see no point of restarting talks until Pyongyang shows an authentic desire to make good on its prior commitments to dismantle its nuclear programs.
Meanwhile, as Kerry tries to prod the Chinese on North Korea, he will also be delivering a stern message on the competing territorial claims and China's bitter dispute with Japan.
His audience -- including Xi, Premier Li Keqiang, Vice President Li Yuanchao, State Councilor Yang Jiechi and Foreign Minister Wang Yi -- may be even tougher on those issues.
Since sometimes violent anti-Japanese protests rocked major Chinese cities in late 2012, Beijing has continually stepped up its rhetoric against Tokyo, dispatching its diplomats to make China's case in the global media and at international forums, even dogging Japanese Prime Minister Shinzo Abe's recent trip to Africa.
Recent weeks have seen China's ambassador to London compare Japan to the evil Lord Voldemort of the Harry Potter books in the pages of Britain's Daily Telegraph newspaper. On Thursday, the official China Daily newspaper devoted a half page to grievances against Japan, while the Foreign Ministry revived the case of a 2010 confrontation between a Chinese fishing boat and Japanese coast guard ships to demand an apology and compensation from Tokyo.
More worrisome, Chinese patrol vessels have maintained a more-or-less constant presence in waters surrounding the disputed Diaoyu islands in the East China Sea, forcing the Japanese coast guard to go on the defensive to avoid a clash.
Chinese ships have also stepped up their presence in the South China Sea, particularly in regards to the Philippines, which is seen by Beijing as weak and overly dependent on the U.S. for protection. Diplomats are concerned that Beijing may be planning to declare an air defense zone above those heavily traversed waters, further raising the chances of confrontation with American surveillance planes and other military flights.
U.S. officials traveling with Kerry said he would urge the Chinese to show restraint, cool down its rhetoric and actions, and clarify its claims consistent with international law.
"The perception in the region and in the United States that is generated by the incremental actions that China has been taking ... is one of a country that is asserting its position through extra-legal and non-diplomatic means," one official said. "That's not a good image of China, and it is not a pattern of behavior by China that the U.S. or others want to see."
China has rejected U.S. criticism of its actions in the past and is expected to do so again in response to Kerry's visit.
Meeting later Friday with senior Chinese diplomat Yang Jiechi, Kerry said U.S.-China cooperation is important not only for the two countries, but for the region and the world as a whole.
"I think the world is always waiting to see whether China and the United States can find the common ground despite some differences," Kerry said.
Associated Press reporter Christopher Bodeen contributed to this report from Beijing.