NATO attributed the massive NotPetya attack to a state actor, not the same as WannaCry. The malware infected over 12,000 devices in around 65 countries, the malicious code hit major industries and critical infrastructure. Attackers might have used a diversionary strategy hide a state-sponsored attack on Ukraine critical infrastructure, NATO CCD COE researchers said. The attack was not too complex, but still complex and expensive enough to have been prepared and executed by unaffiliated hackers for the sake of practice.”]
Source: http://securityaffairs.co/wordpress/60603/hacking/nato-notpetya-state-actor.html