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China blocks airspace for 40 days with no word

Source: telegraph.co.uk

TL;DR

China reserved five patches of offshore airspace off its north-east coast for 40 days starting March 27 with no public explanation.
The zones stretch 340 miles from the Yellow Sea to near Shanghai, with no vertical limit and no announced military drills.
Experts see it as a sign of sustained military readiness rather than short-term exercises, amid regional tensions.

The story at a glance

China has issued Notices to Air Missions reserving five areas of airspace off its north-east coast, running from March 27 to May 6. Beijing gave no reason, though such alerts normally signal military drills that last just days.[[1]](https://www.yahoo.com/news/articles/china-restricts-airspace-40-days-140253686.html)[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5) The move draws attention now because of its length and silence from authorities, against a backdrop of paused then resumed flights near Taiwan.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)

Key points

Airspace covers five separate zones about 340 miles long, from Yellow Sea facing South Korea south to East China Sea near Japan and Shanghai; total area larger than Taiwan's main island.[[1]](https://www.yahoo.com/news/articles/china-restricts-airspace-40-days-140253686.html)[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)
Designated "SFC-UNL" (surface to unlimited altitude), affecting all flight levels; civil aviation can continue with coordination but faces transit limits.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)
No exercises announced, unlike usual practice; past restrictions lasted 3 days at most, issued four times in prior 18 months.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)
Zones sit hundreds of miles from Taiwan, but a senior Taiwan official calls them aimed at Japan to deter US allies.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)
Follows unexplained halt in PLA flights around Taiwan during US-Israel action on Iran, then resumption; coincides with Japan missile deployments and US visits to region.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)

Details and context

The alerts, sourced from US Federal Aviation Administration data, are standard for hazards but rare at this scale without word from China's defense or civil aviation bodies.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5) Experts note the duration points to "sustained operational readiness" over one-off drills, possibly for flexible spring training or air combat practice relevant to Taiwan scenarios.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)

Taiwan sees opportunity in US Middle East focus; upcoming visits include KMT chair to Beijing this week and a delayed Trump-Xi summit in mid-May.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5) No major flare-up expected around these, per analysts.

Key quotes

“What makes this especially notable is the combination of SFC-UNL with an extraordinary 40-day duration—and no announced exercise. That suggests not a discrete exercise but a sustained operational readiness posture.” – Ray Powell, director of Stanford’s SeaLight project.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)

“The zones are clearly aimed at Japan” to deter US allies. – Senior Taiwan security official.[[2]](https://www.wsj.com/world/china/china-creates-new-aviation-mystery-with-offshore-warning-zones-128b1ce5)

Why it matters

The restrictions signal China's push for greater control over key maritime airspace near Japan and South Korea, testing norms without escalation. Airlines and pilots must reroute, while militaries monitor for unannounced activity that could shift Indo-Pacific balances. Watch for exercise announcements or actual flights in the zones through May 6, though experts doubt major action amid diplomacy.