Safe Perimeter An explosives sign is posted in front of a C-17 Globemaster III during a security assistance mission at Dover Air Force Base, Del., Aug. 9, 2022. The Defense Department is providing Ukraine with security assistance to defend against Russian aggression. SHARE: Download: Full Size (1.37 MB) Tags: nato, European Command, Air Force, Partnership, ukraine response Credit: Air Force Airman 1st Class Cydney Lee VIRIN: 220809-F-IF976-1001.JPG Photo Gallery