EU leaders will discuss bolstering Europe's defences and Ukraine's financial firepower at a Wednesday summit in Denmark, where mysterious drone flights have ramped up fears about the threat from Russia.

Thousands of police are on high alert, civilian drones have been banned and NATO allies have sent reinforcements as the continent converges on Copenhagen for the long-planned talks, followed by a broader gathering of European leaders Thursday.

Denmark -- which holds the EU's rotating presidency -- has been rattled in recent days as unidentified drones shut down airports and flew near military sites.

Nordic neighbours as well as allies from the United States to Ukraine have dispatched anti-drone technology and specialists to bolster Denmark's capabilities ahead of the summit talks.

Suspi

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