ABSTRACT The paper examines the external opportunity structures of the EU’s eastern neighbours during times of high security threat. The research investigates when and to what extent opportunities in the neighbourhood affect EU engagement and shape policy-frame alignment. The study introduces the concept of an ‘immediate’ opportunity structure and concludes that the EU’s decisions to initiate or alter policy frames towards countries in the Eastern neighbourhood are driven by immediate security-related opportunity structures that exist at the moment of decision-making. Furthermore, the EU’s decision to engage depends on whether the security threat in the region and the neighbourhood directly affects the Union’s security architecture. As the political environment in the neighbourhood becomes more open and concessions towards the EU increase, the EU boosts its engagement, reflected in its policy alignment. The paper claims that the EU strategy prioritises immediate opportunity structures over indicators of long-term achievements in target countries. This focus on immediate opportunities aims to address, create, and further expand long-term opportunity structures.