The company said it was targeted last month by a major Internet attack launched from China.

VOA: special.2010.01.15

But China,Pyongyang's main patron, has not publicly condemned the attack or even acknowledged that North Korea was to blame.

VOA: standard.2010.05.25

The mourning for the victims of Monday's attack reached northeastern China, home of the third person killed in the blasts, Lu Lingzi.

WSJ: Obama Attends Boston Service as Officials Probe Videos

If China made itself immune from outside attack, it could still be vulnerable to botnets run from within the country, says Allan Paller, director of research at the SANS Institute.

FORBES: China's Golden Cyber-Shield

China has bought 12 Russian Kilo-class diesel attack submarines.

ECONOMIST: China's military might