The Australian Foreign Editor Greg Sheridan warns China, Russia, North Korea and Iran are pouring resources into cyberwarfare while critical Western infrastructure remains dangerously vulnerable to attack. “All of our enemies, China, Russia, North Korea and Iran, are good at cyber because they devote huge resources to it,” Mr Sheridan told News24 host James Macpherson. “All of our infrastructure is pretty vulnerable. “Is it a huge vulnerability? Yes."