A Spanish news report said that a Russian Su-35 fighter flew non-stop from its base in the Baltic to the airspace off Portugal on Nov. 24.
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By Dmitry Terekhov from Odintsovo, Russian Federation (Sukhoi Su-35S) [CC BY-SA 2.0], via Wikimedia Commons
The fighter was accompanied by an aerial refueling tanker. NATO fighters were scrambled along its route to intercept the aircraft.