John Kerry, the United States Secretary of State, has called for China to do more to rein in North Korea’s nuclear activities and decrease tensions over disputed parts of the South China Sea. Wrapping up an eight-day, around-the-world diplomatic mission on Wednesday in Beijing, Kerry hailed US-China cooperation on several issues, including the Iran nuclear deal and climate change, but said consensus on North Korea and the South China Sea remained a work in progress. “Clearly we have several important issues that we need to find the way forward on,” Kerry told reporters as he began his meeting with Chinese Foreign Minister Wang Yi. Kerry called North Korea “a major challenge to global security” and noted US “concerns and activities in the South China Sea”. He said: “We have proven ... when our two countries find common ground and work together, we can make things happen. And it is my hope that today will be constructive and we will find a way forward.” READ MORE: ‘Nuclear blackmail’: North Korea’s bomb test raises threat for China In his opening remarks, Wang mentioned both issues briefly and said he was eager to hear what Kerry had to say. But he offered no hint as to whether China would respond to the entreaties beyond saying he hoped the two nations would be able “to deepen our understanding and mutual trust to deepen our strategic cooperation”. We have proven ... when our two countries find common ground and work together, we can make things happen John Kerry, US Secretary of State The US badly wants China to take a firmer stance in urging North Korea to end its nuclear testing. China is North Korea’s main link to the outside world, and American officials say Beijing is not doing enough to persuade North Korea to stop the tests and return to disarmament talks. The so-called six-party talks between the North and South Korea, the US, China, Russia and Japan have been stalled since they were last held in December 2008. Pyongyang has since conducted three nuclear tests, including the latest on January 6, sparking worries the country has made progress in its bomb programme. Kerry, who after meeting Wang was set to see State Councilor Yang Jiechi and hoped later to meet President Xi Jinping, also called on China to halt land reclamation and construction in disputed areas of the South China Sea, which have alarmed its smaller neighbours. Kerry arrived in China after stops in Laos and Cambodia, where he called on the two members of the Association of Southeast Asian Nations (Asean) to present a united front in dealing with increasing Chinese assertiveness over the South China Sea claims. His visits to Vientiane and Phnom Penh come before a summit with the leaders of all 10 Asean nations that US President Barack Obama will host next month in California. READ MORE: The scale of South China Sea reclamation projects China, which claims sovereignty of much of the territory in the South China Sea, rejects claims from countries like the Philippines and Vietnam and has bristled at US warnings that its activities threaten the freedom of navigation in some of the world’s busiest commercial shipping lanes. Taiwan, Malaysia and Brunei also have overlapping claims in the strategically vital sea, through which around US$5 trillion in world trade passes each year. The US says it takes no position on the claims, but says developments in the South China Sea are a national security interest. It has urged that the disputes be settled peacefully and that a binding code of conduct be established for the area. Tensions have been especially high since Beijing transformed seven disputed reefs into islands, where it is now constructing runways and facilities that rival claimants say can be used militarily. China has said it built the islands primarily to foster safe civilian sea travel and fishing. READ MORE: US warships to visit Spratlys ‘twice a quarter’ in South China Sea but ‘pose no threat’ In response, the US sent the guided-missile destroyer close to one of the Chinese-built islands, called Subi Reef, in October in a challenge to Beijing’s territorial claims, sparking warnings from China. US officials vowed to continue manoeuvres to protect freedom of navigation and overflight. Recent developments, including China’s movement of an oil rig into a zone disputed with Vietnam and warnings against Philippines overflight of what it claims to be its territory, have raised those levels of concern. China dismisses the warnings as unwarranted, but has harshly criticised a US-Philippines defence pact that allows American forces, warships and planes to be based temporarily in local military camps. China says that will “escalate tensions and undermine peace and stability in the region”, echoing language the US uses to criticise China’s actions.