This is the 13907th most frequent Russian word.
оборонно
Defensively.
In this sentence, 'оборонно' is used as part of a compound term ('оборонно-промышленный'), which describes attributes related to defense or military purposes associated with industrial activities.
Область развивает оборонно-промышленный комплекс для укрепления безопасности.
The region is developing the defense-industrial complex to strengthen security.
Here, 'оборонно' is employed adverbially to describe the manner in which he expressed himself, indicating defensiveness or protectiveness over his views.
Во время обсуждения он выразился довольно оборонно, защищая свою точку зрения.
During the discussion, he expressed himself quite defensively, protecting his point of view.
In this case, 'оборонно' is used adverbially to indicate a defensive approach or reaction to certain conditions described in the strategy.