The war in Ukraine has not only reshaped borders on the ground but also transformed the airspace above Europe, forcing NATO’s European allies to redefine aerial security by patrolling a tense new frontier over the Black Sea in what is described as a “policing of the sky” mission aimed at upholding international law and signaling the Alliance’s readiness to respond to any provocation; several times a year, the French Air Force leads these high-risk operations over Romanian waters, to which our reporters Pauline Godart and Olivia Bizot were granted exclusive access.