US and UK take action after accusing China of "malicious cyber activity" affecting millions 

The US and UK are taking action after accusing Beijing of "malicious cyber activity" against millions of targets from Washington to Westminster. On Monday, American and British officials filed charges and imposed sanctions against Chinese state-affiliated hacking groups. China has dismissed the allegations. US and UK officials called out the hacking group Advanced Persistent Threat 31 or APT31, saying it's an arm of China's Ministry of State Security. Reported targets include: White House staff, US Senators, British MPs and officials around the world who are critical of China. Officials in the UK accused APT31 of hacking British lawmakers critical of China and said a second group targeted the UK's electoral watchdog. China's embassy in London says it "strongly opposes" the accusations. Chinese Ministry of Foreign Affairs spokesperson Lin Jian on Monday told reporters: "Sufficient and objective evidence are required when investigating a cyber incident and coming to a conclusion, as opposed to smearing other countries without facts or politicizing cybersecurity." China has also accused the West of hacking campaigns. CNN's Kristie Lu Stout reports.