According a report from the Nuclear Threat Initiative, numerous nations are not prepared to handle the cyber attacks focusing on their nuclear facilities. Just 13 nations merit the most extreme cyber security score of 4 of 4 Australia, United States, Canada, Russia, Belarus, the United Kingdom, Finland, France, Taiwan, Bulgaria, the Netherlands, Hungary and Switzerland. 20 nations got the base score as they dont have even the fundamental necessities for shielding their atomic facilities against assaults over the Internet.”]
Source: https://securityaffairs.co/wordpress/43999/security/nuclear-threat-initiative-report.html