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Official deployments only. Militias and special operations do not count for the purpose of this question. Non-combat units or weapon systems do not count.
Resolves YES for all answers before the event.
Update 2025-02-17 (PST) (AI summary of creator comment): Peacekeeping forces are confirmed to count towards the resolution. This includes:
Officially deployed peacekeeping troops
@AlexbGoode in practical terms, probably yes, but not logically - it should resolve NO if there are ever NATO troops in Ukraine.
@BrunoParga The way I phrased the question means if an earlier version resolves to YES all the later ones will resolve yes as well. And 'never or later' will resolve YES if one of the earlier options resolve yes as well. I wanted something like a cumulative distribution. But for this the 'later or never' option doesn't make sense.