This is the 7252nd most frequent Russian word.
военно
"Военно" means "military" or "relating to the military" in English.
'Военно' modifies 'стратегические вопросы', creating a compound phrase to indicate its relevance to military strategies.
Военно стратегические вопросы требуют особого подхода.
Military strategic questions require a special approach.
'Военно' combines with 'историческими' to specify the area of historical research related to the military aspect.
Он занимается военно историческими исследованиями.
He is engaged in military historical research.
'Военно' acts as an attribute forming a compound noun 'военно училище', relating to the military academy.