China warned Friday that its critical relationship with the United States could break "like a glass," and used the most global of stages to warn the Trump administration it wouldn't be pushed around on trade. Foreign Minister Wang Yi insisted that his country "will not be blackmailed" or bow to pressure. "Protectionism will only hurt oneself, and unilateral moves will bring damage to all," he told the UN General Assembly gathering of world leaders. President Donald Trump this week cranked up punitive tariffs on China, and Beijing responded in kind, escalating a trade war between the world's two largest economies. Trump upped the ante by then accusing China of meddling in the upcoming US midterm elections because it opposes his trade policies. He has presented little evidence to back up the allegations, which China says are untrue. Wang, in separate remarks at a think tank, said US-China relationship was at a critical point, four decades since ties were normalized. "The relationship between our two countries is a common asset. It must be preserved and valued. It's the result of generations of people's efforts," Wang said. "It's like a glass. It's easy to break it" and would be difficult to repair, he said. Although Wang presented China as upholding multilateral institutions \u2014 drawing an implicit contrast with Trump's anti-globalist stance \u2014 Beijing's top diplomat said the suspicions that China seeks global hegemony and to displace the US as a world leader is false. But he warned it's an idea that is spreading, amplifying differences between the two countries. "This is a serious strategic misjudgment," Wang told the Council on Foreign Relations in New York, "that will be extremely detrimental to US interests and the future of the United States." He said China rather seeks a path of peaceful development. He defended China's assertive behaviour in the South China Sea, where it has built man-made islands to reinforce its sweeping territorial claims that are disputed by its neighbours. He said military facilities on those islands are for defensive purposes to counter military activities by other nations in the area, including the United States. Wang also defended China's recent participation in military drills with Russia that have added to US anxiety that its key strategic rivals are setting aside historical differences and teaming up against it. He said military-to-military ties are normal to build "mutual understanding." On human rights, Wang was asked about the reported harsh treatment of Uighur Muslims in China's far west. He maintained that China had brought law and order to a region once blighted by terrorism. The Trump administration is reportedly considering sanctions in response to members of the religious minority being forced into "re-education" camps on a massive scale. Notwithstanding all these differences, the main driver of the current discord between the U.S. and China is trade. Trump increased tariffs Monday on USD 200 billion of Chinese goods. Beijing responded by imposing penalties on USD 60 billion of American products. That was on top of an earlier duty increase by both sides on USD 50 billion of each other's goods. The tit-for-tat is fuelling anxiety that smaller nations will suffer.