Four NATO and European Union member states that share borders with Russia are preparing new defences for their energy infrastructure, following recent Russian drone incursions. Under the plan, concrete bunkers and anti-drone nets will be installed at critical power sites to guard against future attacks.

Violations of Polish airspace by Russian drones this month and multiple drone sightings, including one that forced the closure of Copenhagen Airport for several hours, have raised concerns about NATO’s defences on its eastern flank.

The airspace violations have also increased concerns about the vulnerability of energy facilities in the area, and Poland, Lithuania, Estonia and Latvia have drawn up a plan to protect their power grids which they now treat as a matter of urgency.

Plans T

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