A cyber attack has affected the internet services of Ukraine's state fiscal service since Monday evening, the service said on Tuesday, disrupting programmes used by millions of people for procedures such as filing taxes.
It "has been identified as a denial-of-service attack and an attack protection mechanism has been implemented", said a statement on the organisation's website.
Ukraine has suffered a number of high-profile hacking attacks in recent years that have targeted critical infrastructure such as the electricity grid or institutions such as the Finance Ministry.
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