Putin said: "The initial source of this virus is the United States security agencies."
The infectious malware has been recorded in over 150 countries - who is responsible?
Experts say renewed attacks could hit computers once again if systems are not patched.
Three bitcoin wallets attached to the WannaCry ransomware attack have earned less than £40,000.
United Airlines operates around 4,500 flights to more than 330 destinations across the globe.
High-profile organisations such as the NHS, Renault, FedEx, Bank of China and more were affected.
'The governments of the world should treat this attack as a wake-up call,' Brad Smith, Microsoft president said.
Experts estimate that the ransomware infected over 100,000 computers across nearly 150 countries.
Patients also told to stay away from GPs unless urgent.
Rob Wainwright, director of Europol, said the scale of the attack was unprecedented.
Jonathan Ashworth said that Hunt must face questions on why systems were not replaced.
Hospitals are seen as 'soft targets' due to their antiquated IT systems.
IBTimes UK speaks to experts to find out more about potential cyberthreats in the run-up to the election.
Windows 10 users are largely unaffected by this threat.
The cyberattack is being termed the deadliest and most widespread ever.
Researchers said the complex malware has managed to evade nearly every antivirus solution.
The ransomware was linked to NSA exploits leaked by the Shadow Brokers hacker group in April.
One expert blames the US intelligence agencies for failing to defend their systems in the first place.
The massive ransomware cyberattack resulted in more than 57,000 infections across 99 countries.
Prime Minister confirms international cyberattack but says NHS patient data is safe.
The NHS has gone into meltdown following a computer virus but what can they do about it?
Everything you need to know about the ransomware attacks spreading across the world.
Updating list of NHS trusts and individual hospitals affected by the ransomware cyberattack.
All non-urgent activity has been suspended, NHS England said in a statement.
Spanish telecommunications giant blackmailed by hackers.
NSA Director Mike Rogers said that he was 'personally involved' in overseeing the matter.
A fraud detection firm is using dynamic neural networks to detect crime syndicate botnets imitating humans.
Tass photographer Alexandr Scherbak branded spying accusations 'nonsense'.
The hackers operating the trojan have begun launching redirection attacks to steal financial credentials.
Marketers are reading your eyeballs without persmission to sell you pizza.