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

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.

Suspicions have pointed at Russia for what Prime Minister Mette Frederiksen called a “hybrid attack” — but so far no culprit has been definitively named.

Nonetheless the drone incidents have sharpened the focus on the chinks in Europe’s defenses after high-profile air incursions by Moscow in Poland and Estonia. (AFP)