Two NATO officials, who asked for anonymity to discuss sensitive operational matters, told NBC News U.S. fighter jets were taking off for assignments somewhere in Eastern Europe.
The threat comes amid rising tensions between Moscow and its European neighbours with Russia accused of violating their airspace after a number of drone incursions.
The Russian Ambassador to France has said that there "would be war" if NATO shoots down Russian aircraft in allied airspace.
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Russia's chilling WW3 warning to NATO: Shooting Russian planes will lead to war, Kremlin warns
The threat comes amid rising tensions between Moscow and its European neighbours with Russia accused of violating their ...
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A war between NATO and Russia is at its closest point since the alliance was set up in 1949, experts have said.
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