Brussels: NATO is stepping up aerial surveillance in the Baltic Sea, while France, Germany and Sweden are bolstering Denmark’s air defences ahead of two summits in Copenhagen this week over a series of troubling drone incidents near the country’s airports and military bases.

The number of serious airspace violations in Europe has spiked this month, including by Russian warplanes. But not all NATO allies agree on how to respond. Poland is ready to use lethal force. Others say that must only be a last resort.

Regardless of who is to blame in Denmark, European leaders believe that Russia is testing NATO. Military planners in Moscow can observe how Western forces react, and countering intrusions by relatively cheap drones is a financial burden on the allies.

In the wake of the drone incide

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