`` Kuma '' was on anti-submarine warfare Hostile_encounter exercises Practice .

The accident took place Process_start at the time of the combat missile launches during the joint Ukrainian-Russian military air defense Defending exercises Practice .

the exercises Practice were held Defending at the russian-controlled training Practice ground of the 31st russian black sea fleet research Research center on unk cape near the city of kerch ( crimea ) .

Multiple school districts , California State University at San Marcos , MiraCosta College , and Palomar College were forced Hostile_encounter to cancel classes and close Self_motion schools for one or more days ; CSUSM and Palomar also postponed Change_event_time or cancelled Change_event_time commencement exercises due to the fires .

Operation `` Badr '' was preceded Process_start by training exercises starting in 1968 , operational planning from 1971 onwards and a deception operation .