European security architecture
How a settlement written for one era became the subject of a live negotiation.
Updated 23 August 2026 · 5 events
How we got here
The current arrangement was assembled in stages rather than designed. Each stage solved the problem in front of it and left the next one to a future negotiation.
For two decades the unresolved questions were affordable. Force posture, financing and the sequence of guarantees could be left deliberately vague because nobody expected to test them.
The tests arrived. What is being renegotiated now is not the principle of collective security but the arithmetic underneath it — who pays, who moves first, and on what timetable.
What changed
Ambiguity stopped being free. Once the financing gap was written down, the vagueness that had held the arrangement together became a liability rather than a convenience.
Key events
- Withdrawal of the previous planning assumptions
- Publication of the financing gap
- Circulation of the first guarantee text
Key people
- Marguerite Adeyemi
- Summit secretariat
- Nineteen delegations
Where things stand
Three drafts, nineteen delegations and one closing communiqué. Two clauses on force posture have been removed and may return as an annex.
What happens next
- 01Whether the removed clauses reappear in an annex
- 02The first budget cycle after any agreement
- 03Appointments to the implementation secretariat
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