Brussels — Defense ministers from European countries with borders close to Russia and Ukraine held talks on Friday about building a “drone wall” to plug gaps in their defenses following several airspace violations.

Finland, Estonia, Latvia, Lithuania and Poland have been working on a drone wall project, but in March, the European Union’s executive branch rejected a joint Estonia-Lithuania request for funds to set one up.

Since then, Europe’s borders have been increasingly tested by rogue drones. Russia has been blamed for some of the incidents, but denies that anything was done on purpose or that it played a role.

NATO jets scrambled on Sept. 10 to shoot down a number of Russian drones that breached Polish airspace, in an expensive response to a relatively cheap threat. Airports in Den

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