The future of the Euro-Atlantic security architecture
Think tank: RUSI
Author(s): Ed Arnold; Darya Dolzikova
December 18, 2025
This report from UK think tank RUSI highlights the need for Europe to reshape its security framework to address emerging threats and ensure long-term stability.
This paper highlights the urgent need for Europe to reshape its security framework to address emerging threats and ensure long-term stability and strategic advantage against the most significant challenges to European security since 1945.
The post-1945 Euro-Atlantic security architecture (EASA) – the layered patchwork of organisations, treaties, agreements and norms that have upheld European security for 80 years – is being fundamentally restructured. Many of the shifts are deep rooted, with Russia’s 2022 full-scale invasion of Ukraine currently driving this transformation.
A confluence of external and internal dynamics now amounts to the most acute challenge to the EASA since its inception and will influence how the future EASA develops.