In Skies, As On Land, European Forces Face Gaps If US Pulls Back

European air forces could face gaps if the US pulled out key assets from the continent (Credit: AFP)

Fighter jets from the United States, France, Finland and Germany roar into the skies from a Dutch base as part of NATO's biggest air exercise this year.

The aim: to practice stopping -- and then defeating -- an enemy attack against the alliance as Russia's war in Ukraine fuels fears in Europe.