Estonia is extending a fence along its border with Russia and building anti-tank ditches and bunkers in preparation for a potential conflict with Moscow. But those defenses won’t guard against the threat it and its NATO allies face from Russian drones and electronic warfare.

From the Baltic to the Black Sea, countries bordering Russia, Belarus, and Ukraine are facing the spillover from Moscow’s war in Ukraine.

The incursion of about 20 Russian drones into Poland in September shone a spotlight on holes in NATO’s air defenses, as multimillion-dollar jets had to be scrambled to respond to drones that cost thousands and that ended up crashing into the Polish countryside. Russia denied that it targeted Poland, but Polish officials suggested it was intentional.

Faced with a growing problem, s

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