In recent weeks, the Pentagon has urged several NATO allies, among them Lithuania, Latvia, and Estonia, to tone down their public warnings about the threat from Russia, four people familiar with the matter told Reuters. Pentagon officials argued that some European statements undermined Europe's security, the sources said. Pentagon policy chief Elbridge Colby recently advised a Baltic official against any "poking" of the Russians, one of the people said.

Russia's full-scale war on Ukraine is in its fifth year, and Moscow has spread a deniable arson and sabotage campaign across Europe. As Washington offers Moscow sanctions relief and presses Kyiv to stop hitting Russian energy, the restraint it seeks appears to fall on those Russia threatens, first Ukraine and now NATO's eastern flank.

An Estonian delegation was told to be "measured"

As an example of unhelpful rhetoric, Colby cited Europeans' public suggestions that Russia was "cornered like a rat," the person said. Reuters could not determine whose words he meant. In late September, Estonia said Russia had ordered the arson at Milrem Robotics, a Tallinn company supplying ground robots to Ukraine, and Estonian Prime Minister Kristen Michal likened Putin to a "rat in the corner." Michal said Putin was stepping up activity in Europe to erode the West's backing for Kyiv, and that the surest deterrent was to "back Ukraine."

At another meeting, Pentagon officials asked an Estonian delegation to keep its communications "measured," a person briefed on the encounter said. Another European official described the Pentagon's private messaging this way:

"We are helping you. The Americans are there… Just don't be loud. Don't make noise."

One European official called the advice cordial but baffling, since the Baltic states' own intelligence services have repeatedly judged it unlikely in recent months that Russia would test NATO's mutual defense provisions.

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The Pentagon refused to discuss "private conversations among allies," and the Baltic defense ministries did not reply.

One messenger is a key figure in the review of US troops in Europe

Colby is a key figure in the Pentagon's ongoing review of US force posture in Europe, which could lead to a sharp troop drawdown. In September, the Pentagon was weighing pulling up to 40,000 troops from Europe.

Russia has lately stepped up its deniable attacks on NATO members, Western intelligence officials say. Its suspected arson campaign against Starlink sites serving Ukraine has reached Lithuania, and on 28 October German prosecutors announced the arrest of two Belarusians suspected of plotting arson near Nuremberg. Russia denies running a sabotage campaign. Meanwhile, US officials have discussed business deals with Russia, which many European officials oppose.