On the face of it, the intrusion of Russian drones into Polish airspace overnight would appear to be an open and shut case for invoking Nato’s famous Article 5, which, as commonly summed up, means that an attack on one is deemed an attack on all and warrants a corresponding response.
This guarantee is much of the reason why, after the Soviet Union’s collapse, the newly independent states of eastern and central Europe wanted to join the alliance, and why Ukraine is so keen to do so now. Nato and Article 5 are seen as the gold standard of security guarantees.
