Fort Meade, September 12

US President Barack Obama on Friday warned that cyber attacks from China were ‘not acceptable’, a message he is set to deliver when President Xi Jinping visits the White House this month.

Obama said state actors needed to agree rules of the road in order to stop cyber crises from escalating.

“There comes a point at which we consider this a core national security threat and will treat it as such,” he said.

Ahead of Xi’s state visit, Obama said ‘we have been very clear to the Chinese that there are certain practices that they are engaging in, that we know are emanating from China and are not acceptable’.

In a notably tough and confrontational tone, Obama said states could ‘choose to make this an area of competition’.

But, he warned, if that path was chosen it would be a competition that ‘I guarantee you we will win if we have to’.

Following a spate of hack on US companies and government agencies that have been widely blamed on China, administration officials have pointedly let it be known that Chinese firms and individuals could face sanctions.

The move appears to be triggered in particularly by a recent breach of US federal government personnel files that left exposed millions of officials — including some at the very top levels — exposed.