noun which may take the genitive case particle 'no'
Used as a no-adjective to modify nouns, meaning 'strategic' or 'from a strategic standpoint'.
戦略上の理由で撤退した。
They withdrew for strategic reasons.
strategically; from a strategic point of view
Adverbial use, often with に or as a standalone adverb.
戦略上、この地域は重要だ。
Strategically, this region is important.