Russia's "Doomsday Radio" has eerily spelled out the name of a Nato ally which may be under threat.
The radio station has been in use since the Soviet era and typically blurts out an assortment of random buzzes and noises.
But on Monday, the mysterious radio network emitted a message far clearer than usual amid a flurry of coded messages.
The messages recorded were: NZHTI NZHTI 15854 LATVIA 5894 4167.
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Latvia shares a 170-mile border with Russia and it has been deemed vulnerable to invasion alongside neighbours Estonia and Lithuania.
Like Ukraine, it is a former Soviet state.
If Mr Putin's forces were to invade, Nato's Article 5 would doubtless be invoked - potentially triggering a large-scale conflict.
The radio station is believed to come alive during times of heightened global tensions.
It is believed that the coded messages are broadcast by Russian Strategic Forces networks, which have strong ties to Russia's nuclear arsenal.
If Mr Putin's forces were to invade, it could potentially trigger a large-scale global conflict
| GETTYIn September, the radio station whirred into life with two cryptic Russian voice messages.
Listeners picked up the codewords "NZHTI" and "HOTEL" along with a puzzling sequence of numbers: 38, 965, 78, 58, 88, and 37.
Just days after the mysterious transmission was heard, a host of Russian drones breached Polish airspace, forcing the Nato member state to shoot them down.
In October, a series of codes were broadcast again by the station, formally known as the UVB-76 shortwave station.
RUSSIA - READ THE LATEST:
Latvia shares a 170-mile border with Russia and it has been deemed vulnerable to invasion
|REUTERS
Nato members, mapped: Who makes up the alliance? | GB NEWSIt put out the codes: NZhTI 33438 DON QUIXOTE 1745 1643 and NZhTI 34948 DYROKOL 0091 5671, with Dyrokol translating to hole punch in English.
After specifically naming Latvia, another bizarre messaged was picked up from the station on Monday.
It stated: NZhTI 07377 POSAZHENY 9051 8779.
Posazheny means the figure who stands in for the bride or groom’s parents during a traditional folk wedding ceremony.
PICTURED: The entrance to what's believed to be the UVB-76 shortwave station's home outside St Petersburg | GOOGLEElectronic and radio engineering professor David Stupples from City University of London previously claimed Mr Putin's Government is "almost certainly" behind the transmissions.
He told Popular Mechanics: "If it is the Russian Government, it wouldn't be for peaceful purposes."
Dutch radio enthusiast Ary Boender explained: "Some say that it is an old Soviet Dead Man's Switch that triggers a nuclear attack on the West when it stops buzzing.
"Others say that it is a homing beacon for UFOs, or a mind control device with which the Russians can program your mind."
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