1990 · Pereslavl-Zalessky, Zagorsk, Kirzhach and nearby (Moscow Air Defence District)

The Pereslavl-Zalessky interceptor event

Sourced, unconfirmed

Strength B · 7/10 · 2 independent

Evidence 2/4 · Witnesses 3/3 · Backing 2/3

The Air Defence chief of staff released named officers' written reports, with a pilot's close approach; one radar company saw nothing unidentified.

Plausibility High

Score 11 · 6 factors for, 0 against

The Soviet Air Defence chief of staff released named officers' reports, including a pilot's close approach; one radar company saw nothing.

See the factors ↓

Unresolved

Part ofOrdered to fire

From the Soviet Air Defence reports released by Col.-Gen. Igor Maltsev: an interceptor closed to 500-600 m on a large object with two flashing lights near Pereslavl-Zalessky, 21 March 1990. · Illustration for uaptrail.com

When21 March 1990, about 20:00–24:00

WherePereslavl-Zalessky, Zagorsk, Kirzhach and nearby (Moscow Air Defence District)

Backing2 independent

Witnesses1 named

Evidenceofficial records

On the evening of 21 March 1990 more than a hundred servicemen across the Moscow Air Defence District reported a large object near Pereslavl-Zalessky and Kirzhach. An interceptor was scrambled; its pilot closed to 500–600 m, saw two bright flashing lights and a silhouette, and locked the target on his radar sight. Officers described a disc 100–200 m across. A month later the Chief of the Main Staff of Soviet Air Defence, Col.-Gen. Igor Maltsev, released their reports to Rabochaya Tribuna and said the object seemed to have no inertia. One radar company recorded no unidentified targets.

Evidence, in date order (2)

21 Mar 1990Over 100 visual reports collected by unit commanderswitness
named reports from Sgt N. Fedorovich and Capts V. Barin, V. Ivchenko, N. Filatov and I. Lapin; an observation-post log 21:19–22:05 Rabochaya Tribuna
19 Apr 1990Col.-Gen. Igor Maltsev, Chief of the Main Staff of the PVOofficial
supplied the officers' reports and commented on the record Gen. Igor Maltsev

How plausible · High

The Soviet Air Defence chief of staff released named officers' reports, including a pilot's close approach; one radar company saw nothing.

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Access Officers and a pilot.
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No gain sought Official.
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Character record Officers.
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Independent convergence Many reports.
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Checkable details check out Released reports.
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Physical traces or official reaction Radar, inconsistent.

Plausibility weighs how well an account fits where secrecy hides the documents by design, so missing records never count against it. Strength measures what is documented. Assessed 2026-10-23.

Claims

A disc 100–200 m across, rotating, moving 'like a snake' at up to 2–3 times a fighter's speed; 'it seemed the UFOs had no inertia at all'; seen on the aircraft's radar sight and several radar stations.firsthandOn the recordperson/igor-maltsev, Rabochaya Tribuna (19 Apr 1990)

Scrambled at 21:38, he closed to 500–600 m at 2,000 m altitude and saw 'two bright white flashing lights', briefly a silhouette, and lit the target on his radar sight.firsthandSourced, unconfirmedLt-Col A.A. Semeichenko (interceptor pilot)

A 'flying saucer'… about 100–200 metres in diameter.firsthandSourced, unconfirmedCapt. V. Barin

A radar company near Pereslavl went to readiness No. 1 at 21:40 and saw no targets without IFF.firsthandOn the recordradar company report (Rabochaya Tribuna)

A blimp or aircraft with strobes. Proposed by skeptics, not demonstrated.speculationLeadskeptics

Where

Pereslavl-Zalessky, Zagorsk, Kirzhach and nearby (Moscow Air Defence District)

56.7°N 38.9°E

In The picture

On the recordThe firmest layer is the one trained observers and instruments wrote down. Belgian gendarmes watched silent lit triangles in 1989-90 and ground radars tracked the wave; the Air Force sent F-16s and released its own data, though a radar study it released in 2025 puts the fighters' lock-ons down to their tracking softw…