Deadly Escalation by Foreign Entities Notification and Disclosure Act or the DEFEND Act This bill requires the Office of the Director of National Intelligence (ODNI) to brief Congress if ODNI determines with moderate or high confidence that a foreign government is deliberately seeking to kill or cause serious bodily injury to any member of the Armed Forces, either directly or indirectly. The briefing shall include information such as a description of the nature and extent of the foreign government's efforts and an assessment of the foreign government's motivations. After giving an initial briefing, the ODNI shall give periodic updated briefings.