Stoltenberg Handshake NATO Secretary General Jens Stoltenberg welcomes Acting Defense Secretary Dr. Mark T. Esper to Brussels for the NATO defense ministers meeting, June 26, 2019. SHARE: Download: Full Size (0.83 MB) Tags: nato, partnerships, Esper, Acting Defense Secretary Credit: NATO VIRIN: 190626-O-ZZ999-001E.JPG Photo Gallery