At 12:45 on Sunday afternoon, Polish controllers pulled a slice of airspace east of Lublin out of civil use. At 13:15, Poland’s Operational Command announced that an unidentified object had crossed from the direction of Belarus. A duty Mi-24 was already on its way to look.

At 14:17, ninety-two minutes after the first restriction, the command posted the answer. It was a large flock of birds.

It is tempting to file that under comic relief. It should not be. The reason a bird flock now triggers a helicopter launch and an airspace closure on Poland’s eastern border is that over the past twelve months almost everything else that came across it was real.

Ninety-Two Minutes

The initial statement from Dowództwo Operacyjne Rodzajów Sił Zbrojnych was carefully hedged from the outset. The Air Operations Centre was running verification specifically to rule out, among other possibilities, that the registered signal was the result of meteorological phenomena or anomalies.

It also noted that no Russian long-range aviation activity connected with strikes on Ukraine had been observed in recent hours — which is the detail that made a stray cruise missile or a Shahed implausible before anyone got airborne.

The choice of aircraft is worth a moment. Poland did not scramble F-16s. It sent a duty Mi-24 — a heavily armed Soviet-designed gunship, slow, low and able to loiter and look at something small. For an unidentified low-and-slow contact that is the sensible tool. A Falcon at 400 knots is very bad at finding a balloon, a light aircraft or, as it turns out, a flock of migrating birds.

The Polish command published a further explainer that evening, responding to what it described as doubts and questions about the day’s military activity. That is a small but telling thing: an air force that now feels obliged to explain itself to a public which has learned to notice.

Why Poland Checks Everything Now

Twelve months ago this would have been an unremarkable radar glitch. The reason it is not is a list.

On the night of 9–10 September 2025, at least nineteen Russian drones entered Polish airspace, many of them via Belarus. Up to four were shot down — most, notably, by Royal Netherlands Air Force F-35s operating alongside Polish F-16s, an Italian AEW&C aircraft and a Belgian A330 MRTT. It was the first time a NATO country had destroyed Russian assets since February 2022. Warsaw Chopin, Modlin, Rzeszów and Lublin all closed. A stray AMRAAM fired by a Polish F-16 came down on a house roof at Wyryki-Wola without hurting anyone.

Poland invoked NATO’s Article 4 the following day, only the eighth time in the alliance’s history. Two days after that, NATO launched Operation Eastern Sentry. Nine days later three Russian MiG-31s spent twelve minutes inside Estonian airspace and Estonia invoked Article 4 as well.

Since then: balloons crossing from Belarus over Christmas 2025 and again on three consecutive nights in early February 2026, which the Polish command described as another attempt at reconnaissance and at checking the reaction of Polish air defences. A Russian Kh-101 cruise missile detonating roughly a hundred kilometres inside Poland at Tarnawa-Kolonia on the night of 29–30 July 2026, leaving a crater ten metres across. NATO’s North Atlantic Council formally assigning Russia full responsibility for Polish and Romanian airspace violations on 12 August. Sustained GPS jamming in the Baltic, including against the minehunter ORP Albatros.

And on 31 August, Polish fighters intercepted a Russian Il-20 about thirty kilometres north of Łeba — at least the seventh Il-20 intercept of 2026 alone.

The Line Is Moving Down

There is a more consequential development in the same week, and it did not get a fraction of the attention.

Poland is introducing a restricted zone, EP R134, along the Ukrainian and Belarusian borders from ground level to flight level 95 — roughly 3,000 metres. It runs from 10 September to 9 December 2026, replacing the EP R131 zone that covered the previous three months.

That is the real story of Poland’s eastern airspace: not one afternoon of birds, but a rolling low-altitude restriction that keeps getting renewed. The threat has moved down into the layer where light aircraft, balloons, drones and, occasionally, geese all live — and where telling them apart takes a helicopter and ninety minutes.

Sources: Dowództwo Operacyjne Rodzajów Sił Zbrojnych, TVN24, RMF24, Polsat News, Reuters, UK Defence Journal, NATO SHAPE, Militarnyi, Defence Blog.