The Gulf nations are constantly exposed to the threat of war.
Literal
Gulf countries [topic-は] constantly war [possessive-の] threat [locative-に] be-exposed-[state-ている].
A geopolitical statement. 湾岸諸国 ('Gulf countries') uses 諸 (しょ) as a prefix meaning 'various, multiple' — 諸国 ('various countries'). 脅威 (きょうい) 'threat' is formal vocabulary. さらされる is the passive of さらす ('to expose'). The ~ている form marks the ongoing state of being exposed.