Sino-American relations have been on a rollercoaster ride during the Barack Obama administration. At the outset of Obama's term as president, ties between the two powers seemed to be on steady footing. But keep in mind that the honeymoon between the US and Beijing was set against the global financial crisis, when bilateral cooperation was vital. Many problems were masked by the collective effort to stop the economy's hemorrhaging.

Since China's economic outlook has turned rosier now, hidden conflicts have risen to the surface. After Obama's visit to China last November, relations have plunged to a new low, mainly because of disputes on climate change, bilateral trade, Internet censorship, the arms sale to Taiwan and Obama's meeting with the Dalai Lama.

Obama's initial policy toward China in early 2009 raised expectations that both sides would work cooperatively. The US expected China to have its full support on many issues, and China hoped that the US would show more respect to its core interests and treat the nation with fairness.

But as expectations grew higher, disappointments slowly mounted. Each nation has been unable to step away from its own interests and viewpoints. China enshrines its national interests and principles, and will not blindly follow the US' lead. The US, as the only superpower, has not learned to respect the sovereignty, core interests and values of other countries, and does not know how to treat others equally. Disputes and conflicts are inevitable.

After Obama's trip, critics in the US assailed Sino-US relations and exclaimed that the joint communiqué only reflected China's interests above the US' interests. Behind the criticism lay three deep-rooted feelings against China.

The first is disappointment. In the short term, the US feels that China has not supported its views and has not complied with the US on many international issues. In the long run, China has not been Westernized despite rapid economic development, which has dissatisfied the US. Instead, the US believes China has been persistent in its "socialism with Chinese characteristics" and its own developmental model. With both the US' short and long expectations of China falling short, it is not surprising that the US feels disappointed.

The US seems to be unhappy about China's defiance, too. Along with its rising national power and international influence, China has made its voice heard at the international stage, strengthened participation in the international affairs and has become more self-confident. Since the US is used to a silent China that keeps a low profile, it still can't accommodate the growing confidence of China, and regards China's non-compliance as offensive and arrogant.

The US also feels upset by its draining superiority. The global financial crisis accelerated the decline of American hegemony and the rise of China's international status. With more balanced capabilities between China and the US, both the American government and people have gradually lost their sense of superiority in dealing with China. They feel disgruntled about the sea change.

The US has grown sensitive to China's development as well as its behavior on the international stage, prompting Washington's provocative actions against China.

A new phenomenon in this recent diplomatic row is China's more resolute response to US' provocative actions. Besides criticism, China has adopted substantial countermeasures. James Mulvenon, director of the Center for Intelligence Research and Analysis in Washington, said that China's tough stance against the US arms sale to Taiwan symbolized a "turning point".