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Amid rising threats, NATO holds its largest-ever cyberdefense exercise

NATO Allies and partner cyber defenders gathered in Tallinn, Estonia from Nov. 28 to Dec. 4, 2025, to test their ability to protect networks and critical infrastructure against realistic and complex cyber threats during exercise Cyber Coalition. (NATO Photo by SHAPE Public Affairs Office)

By Alexander Martin

NATO this week challenged around 1,300 participants in a cyberdefense exercise to guard against major attacks on critical infrastructure including power plants, fuel depots, commercial satellites and military networks.

The annual Cyber Coalition exercise is intended to cover more than just the basics of network defense. Participants deal with the complicated and multi-faceted threats that have been seen in recent conflicts around the world, including attempts to stir social unrest and degrade military capabilities.

This year’s drill saw 29 allies, alongside seven partner nations, coordinate their responses to seven major storylines — all of which are designed to stay below NATO’s Article 5 threshold for collective defense — at Estonia’s national cyber range, CR14, established and supported by the country’s Ministry of Defence. It was NATO’s largest-ever cyberdefense exercise.

Read more at The Record

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