Russian hackers have recently attempted to penetrate the networks of NATO and the militaries of some eastern European countries, Google's Threat Analysis Group said in a report published on Wednesday.
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The report did not say which militaries had been targeted in what Google described as "credential phishing campaigns" launched by a Russian-based group called Coldriver, or Callisto.
"These campaigns were sent using newly created Gmail accounts to non-Google accounts, so the success rate of these campaigns is unknown," the report said.
NATO was not immediately available for comment on the report.
Russia, which is now under heavy Western economic sanctions following its decision to invade Ukraine on Feb. 24, regularly denies accusations of mounting cyberattacks on Western targets.