TOKYO – A lot has happened in Asia while the United States was off fighting its wars in Iraq and Afghanistan, and most of it can be summed up in one word — China. Fueled by China's amazing growth and the promise of its huge and expanding consumer market, the Asia-Pacific region is now, as experts like to say, the global economy's center of gravity. Sorry, Europe.

But prosperity requires stability.

As President Barack Obama tours the region to push his year-old pivot to the Pacific policy, the big question on everybody's mind is how much of a role Washington, with its mighty military and immense diplomatic clout, can play in keeping the Pacific — well, pacific. Here's a look at how different countries perceive the U.S. Pacific policy and how it impacts them: