By Matt Spetalnick, Andrew Gray, Andreas Rinke and John Irish

WASHINGTON/BRUSSELS/BERLIN/PARIS (Reuters) -The swarm of nearly 20 drones across Polish borders this week triggered deep anxiety among NATO members who, for the first time since the start of the war in Ukraine, fired on a Russian target, violating the alliance’s airspace.

Just as worrisome, said European diplomats, has been U.S. President Donald Trump’s refusal so far to publicly hold Moscow accountable for Wednesday’s incident, coupled with the lack of U.S. participation in fending it off.

Many alliance members already question Trump’s commitment to their defense in the event of an actual Russian attack.

Trump’s muted response was widely seen as another example of his “America First” push for European allies to take more re

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