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The website of Ukraine's energy and coal ministry website has been hit by a cyber attack, though the websites of state-run energy companies have not been affected, the ministry's spokeswoman said by phone.

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As of 07:34 GMT, a message posted in English on the website was demanding a ransom paid in Bitcoin to recover encrypted files, Reuters reported.

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"Our specialists are working right now... We do not know how long it will take to resolve the issue," the spokeswoman said.

"Ukrenergo, Energoatom – everything is okay with their sites, it's only our site that does not work."