Still, any new measures “need to have plausible deniability,” said one EU diplomat.

Show of force

NATO, for its part, is a defensive organization and so is leery of offensive operations. “Asymmetric responses are an important part of the conversation,” said one NATO diplomat, but “we aren’t going to stoop to the same tactics as Russia.”

Instead, the alliance should prioritize shows of force that illustrate strength and unity, said Oana Lungescu, a former NATO spokesperson and fellow with London’s Royal United Services Institute think tank. In practice, that means rapidly announcing whether Moscow is behind a hybrid attack and running ‘no-notice’ military exercises on the Russian border with Lithuania or Estonia.

Meanwhile, the NATO-backed European Centre of Excellence for Countering Hybrid Threats in Helsinki, which brings together allied officials, is also “providing expertise and training” and drafting “policies to counter those threats,” said Maarten ten Wolde, a senior analyst at the organization. 

“Undoubtedly, more should be done on hybrid,” said one senior NATO diplomat, including increasing collective attribution after attacks and making sure to “show through various means that we pay attention and can shift assets around in a flexible way.”

Jacopo Barigazzi, Nicholas Vinocur, Nette Nöstlinger, Antoaneta Roussi and Seb Starvecic contributed reporting.