Russian cyberattacks have targeted millions of computers, including home wifi routers

Tens of thousands of devices in British homes are in the sights of Kremlin-backed cyber-expertsRITCHIE B TONGO/EPA

A global Russian hacking offensive has targeted millions of computers to spy on governments and lay the foundation for an attack on infrastructure, Britain and the United States warned last night.Tens of thousands of devices in British homes including wifi boxes are in the sights of Kremlin-backed cyber-experts who are searching for weaknesses such as easy-to-guess passwords and expired anti-virus software.Security officials said yesterday that Russian hackers were seeking to find ways to sit invisibly within networks enabling them to launch a cyberattack should the order be given. Businesses have also been targeted as hackers have sought to steal intellectual property.