The Defense Attaché Office (DAO) is a Joint-Service Department of Defense office that advises the Ambassador and Country Team on all defense and security matters and provides timely, accurate information to senior leaders on defense and security issues affecting Ukraine and the region.

Comprised of representatives from all four branches of the United States military, the DAO liaises across a broad spectrum within the Ministry of Defense of Ukraine. In cooperation with their Ukrainian military counterparts, members of the DAO execute events and programs associated with both the Security Cooperation and the European Command (EUCOM) Military-to-Military contact plans that build Ukrainian Armed Forces combat capabilities and advance the Ukrainian military toward NATO interoperability.