# Russian Su-27 collided with a US MQ-9 Reaper over the Black Sea, forcing it down revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Incident: [Russian Su-27 collided with a US MQ-9 Reaper over the Black Sea, forcing it down](/incidents/mq9-reaper-black-sea-su27-collision-2023.md)

## Recorded posture

- First recorded event: 2026-06-04
- Last material change: 2026-06-04
- Material event count: 1
- Editorial event count: 0

## Material events (1)

- **2026-06-04**: created (source: baseline:arc-g)

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /incidents/mq9-reaper-black-sea-su27-collision-2023/history. REST: /v1/incidents/61aa56ba-accc-4552-b29a-77cc0fb6aa94/history. HTML: [/incidents/mq9-reaper-black-sea-su27-collision-2023/history](/incidents/mq9-reaper-black-sea-su27-collision-2023/history)._