This certainly ups the ante of response.
Check it out:

China may have helped North Korea carry out the hacking attack on Sony Pictures, a US official has told Reuters.

The official, who spoke on condition of anonymity, said the conclusion of the US investigation was to be announced later by federal authorities.

The Chinese embassy in Washington later stated that China does not support “cyber illegalities”.

There were also reports on Friday that Iran and Russia may have also helped the North Korean hackers.

The software used in the hacking was at a level of sophistication not previously seen in past North Korean attacks, a US intelligence source told Fox News, adding that China, Iran and Russia had all used the technology previously.