WatchTaiwan StraitQuestion
MilitaryActive
Has detected activity moved off the post-Justice-Mission baseline?
Monthly aggregates from official reporting — air and naval read separately, and never a daily counter.
- Opened
- Last reviewed
- Status as of
- Reviews
- 13 since 2026-08-02
- Confidence
- Moderate confidence
A Watch question is not a forecast. It names the evidence that would change an assessment and records what each review found — including the reviews that found nothing moved.
Where it stands
Standing assessment
Current assessment
Moderate confidenceAs of
Taiwan's defence ministry recorded 125 PLA aircraft entering the air defence identification zone in August 2026, less than half the August totals of 2024 and 2025.
Read with the coast guard figures of the same window, the two official series point the same way: the air lane is quieter than in recent years and the maritime civil lane is at a record. Naval presence remains within the 5–9 vessels-a-day range that held through 2025.
Latest reviewNo material change3 without change
One designated patrol, on 20 October, with far-seas long-range training and the western Pacific named as well as the strait's areas, not instead of them: the fourth of October, the top of the run. The daily reports counted 5, 14 and 29 aircraft for 18–20 October and none in the four reports covering 21–24 October, which give no reason; one to seven PLAN ships a day. No named exercise.
The standing file was checked and nothing moved. A finding, not an absence. The condition stands as of .
- 2026-08-09: No material change
- 2026-08-16: No material change
- 2026-08-23: No material change
- 2026-08-30: No material change
- 2026-09-06: Movement observed
- 2026-09-13: No material change
- 2026-09-20: No material change
- 2026-09-27: No material change
- 2026-10-04: Movement observed
- 2026-10-11: No material change
- 2026-10-18: No material change
- 2026-10-25: No material change
What would change the assessment2 assessment-change conditions · qualitative, as the record states them
A monthly air aggregate back at or above the 2025 monthly levels outside an exercise window, or a naval average sustained for a month outside the 5–9 range.
A change in what the ministry publishes
Assessment effectchanges what the series measures before it changes what it shows.
Observables5 named · “met” describes evidence, not success
01Test
The monthly ADIZ aircraft aggregate
Taiwan's ministry publishes daily detections; the observable is the monthly total against the same month in prior years and against the post-Justice-Mission run.
03Test
A spike tied to a named exercise or political date
Spikes on political calendars are the established pattern and are not read as a baseline shift; a spike with no calendar reason is.
04Test
A named large-scale exercise
A Justice Mission-class exercise announced by Eastern Theatre Command, which resets the baseline the question is read against.
05Test
The cadence of designated joint combat readiness patrols
Patrols the ministry designates in a release, counted per month on the module's recorded series against the 2026 run of two to four a month — the one PLA activity class that is an enumerable occurrence rather than a daily aggregate. A month at zero or at twice the run is the marker.
Review ledger13 entries · opened · newest first, each tied to the review that made it
No material change
One designated patrol, on 20 October, with far-seas long-range training and the western Pacific named as well as the strait's areas, not instead of them: the fourth of October, the top of the run. The daily reports counted 5, 14 and 29 aircraft for 18–20 October and none in the four reports covering 21–24 October, which give no reason; one to seven PLAN ships a day. No named exercise.
Brief item One designated PLA patrol, paired with far-seas training on 20 October, was followed by four daily reports in which Taiwan's defence ministry detected no PLA aircraftReviewed in 2026-10-25
No material change
One designated joint combat readiness patrol, on 14 October: 13 aircraft, 11 across the median line. Daily reports for 11 to 18 October show 2 to 15 aircraft and 5 to 10 naval vessels a day, with one day at 10; no named exercise and no balloon. The 2024 comparison, a named exercise within days of the National Day address, did not recur in the week.
Brief item One designated PLA patrol and two coast guard entries, at Kinmen and at Pratas, kept the military and maritime signals inside their established patternReviewed in 2026-10-18
No material change
Two designated patrols on the ministry's releases: 6 October (14 aircraft, 9 across the median line) and 9 October, the eve of Taiwan's National Day (19, 13 across). No aircraft in three daily reports from 3 to 6 October; five to eight naval vessels a day. No named exercise followed the National Day address by the cutoff.
Brief item Taipei and Beijing used National Day to restate their formulas, and the military and coast guard signals around it stayed within patternReviewed in 2026-10-11
Movement observed
One designated patrol, 30 September, the eve of PRC National Day: 21 aircraft, 15 across the median line. September closes with four (5, 9, 17, 30), the top of the 2026 run. Daily detections 0–23 aircraft and five to seven naval vessels to 4 October, inside the range; no named exercise. The September aggregate was not compiled.
Weekly Brief Taiwan Strait developments — 4 October 2026
No material change
Checked against the official series. No joint combat readiness patrol was designated from 18 to 26 September — verified against both the English and the Chinese release lists — and September holds three designated patrols, on 5, 9 and 17 September, inside the two-to-four run. Daily detections ran at two to ten aircraft a day from 20 to 26 September, a window that included the Chinese president's state visit to Washington, with five to eleven naval vessels a day. No named exercise. The September monthly aggregate is not yet published, and nothing here reads intent into the quiet days.
Weekly Brief Taiwan Strait developments — 27 September 2026
No material change
Checked against the official aggregates, which is how this question is read. Taiwan's Ministry of National Defense designated no joint combat readiness patrol in the window; the last two were on 5 and 9 September. Daily detections stayed within the pattern - 28 sorties with 24 median-line crossings, seven navy and two official vessels on 18 September, the day of Taiwan's own live-fire exercise - and no named large-scale exercise was announced in response to it. No monthly aggregate departure and no exercise-window spike.
Weekly Brief Taiwan Strait developments — 20 September 2026
No material change
Daily defence-ministry figures through the window stayed inside the ranges the August totals describe — eighteen aircraft sorties with thirteen median-line crossings and eight naval vessels on 9 September is an ordinary day on that baseline. No exercise was announced and no closure area was declared.
Weekly Brief Taiwan Strait developments — 13 September 2026
Movement observed
Now measured rather than described: 125 aircraft in August, less than half the August totals of 2024 and 2025. The first window in which both halves of the standing argument carry an official number. Not elevated to an item because it confirms an established reading rather than changing one.
Weekly Brief Taiwan Strait developments — 6 September 2026
No material change
Fighter sortie levels near Taiwan continue to be described as materially below recent years — the condition the maritime figures of the same week are read against rather than separately from.
Weekly Brief Taiwan Strait developments — 30 August 2026
No material change
No change identified in the reported trend.
Weekly Brief Taiwan Strait developments — 23 August 2026
No material change
Reporting noted fighter activity in the first half of 2026 at a three-year low — consistent with the standing position that activity counts are not a threat metric in either direction.
Weekly Brief Taiwan Strait developments — 16 August 2026
No material change
No change identified in the reported trend since early 2026.
Weekly Brief Taiwan Strait developments — 9 August 2026
Baseline
Opened from the module's standing question at its first weekly review: reported air activity down through 2026 from the December 2025 exercise peak, naval presence within its standing range.
Weekly Brief Taiwan Strait developments — 2 August 2026
Connected system18 canonical records this question runs through · Watch owns the edge; each record shows the question back
Parties and forces 6
Actors
Means and systems 4
Equipment
Campaigns
Ground 2
Arrangements and events 3
Relationships
Vigil analysis 3
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Assessed as of — 2026-09-06 Last reviewed — 2026-10-25
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