The Chinese seem to want to "push" to see if we've got a wussy/weakling Commander in Chief. That sort of taunting is profoundly rude, to say nothing of dangerous.
They pulled the same shit with Bush in 2001....remember the P-3 that their jet ran into, which required the P-3 to do an emergency landing and we lost a shitload of intel as a consequence? They held the crew for awhile, too. This article mentions that:
In April 2001, in a similar incident a U.S. Navy P-3 plane was on a submarine surveillance mission over the South China sea when it collided with a Chinese MIG fighter jet and was forced to make and emergency landing on Hainan Island. The Chinese Mig crashed into the sea and the pilot was killed. The Chinese held the 24 Navy crewmembers for 11 days before releasing them, but refused to allow the U.S. to repair and fly the P-3 off the island. The P-3 was instead dismantled, returned in pieces to the U.S. where it was reassembled and returned to service.
The U.S. is expected to lodge a protest over the incident, but there may not be much public outcry from the U.S. government. White House spokesman Robert Gibbs would only say today that "We are going to continue to operate in those international waters and we expect the Chinese to observe international laws around them." At a time when the Obama administration is attempting to cozy up to China diplomatically, it appears the administration has no desire to make any sizeable waves over this issue.
Of course, they weren't aware that Bush was a vindictive, war-starting sumbitch at the time.
I wonder what sort of message Secretary Clinton will be tasked to deliver to those clowns?