Danish Defense Minister Troels Lund Poulsen holds a press conference to address government accusations against Russia over recent cyberattacks targeting public infrastructure and election campaigns, Copenhagen, Denmark, December 18, 2025. NILS MEILVANG / AFP
Denmark on Thursday, December 18, accused two hacker groups linked to the Russian state of carrying out two cyberattacks, one on a Danish water treatment plant in 2024 and one on local elections last month. Defense Minister Troels Lund Poulsen told a press conference the government would summon the Russian ambassador over the matter.
Water pipes were exploded in the 2024 attack conducted by Z-Pentest, in which household water supply was affected, he said. Then, on the eve of Denmark's municipal and regional elections in November, the websites of several political parties, municipalities, public institutions and a defense company were inaccessible due to a cyberattack claimed by the Russian hacker group NoName057.
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"We are very confident that these are pro-Russian groups linked to the Russian state," said the head of Denmark's military intelligence agency, Thomas Ahrenkiel.
