Donald Trump declared that under his future presidency, the United States would not protect “deadbeat” NATO members from a Russian attack. This provoked an immediate reaction from Josep Borrell, head of European diplomacy, who recalled that NATO was "not an à la carte alliance" The issue of unequal financial participation by NATO member countries is not new.

But in the current context of war in Ukraine and the Russian threat on Europe's borders, the possibility of Donald Trump's return to the White House worries Europeans.