China, which has long chafed at US accusations that it carries out extensive surveillance on American government and commercial operations, may now have to make a decision on how to deal with the problem presented by the 29-year-old Edward Snowden, who has come out as the source of the leaks.
But Snowden's presence in Hong Kong has already dragged China into what would have been a domestic issue for the United States.
"It's going to be seen by both sides as an unwelcome distraction," said Jean-Pierre Cabestan, a China politics expert at the Hong Kong Baptist University.
"This comes at a delicate time because of the Xi-Obama summit and the much bigger issues that both countries have to tackle and both governments and presidents have to discuss."
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Snowden was working as a contractor in an NSA office in Hawaii until he left for Hong Kong on May 20, the Guardian reported.
Snowden checked out of Hong Kong's Mira Hotel today. It was unclear where he went next.
US officials see cybersecurity as probably the most pressing bilateral challenge, and Obama confronted Xi with specific evidence of intellectual property theft the US says is coming from China. Xi said China was also a victim of cyber-attacks but did not publicly acknowledge his own country's alleged activities.