Try ordering an Uber, chasing a Pokemon, or simply checking your map while out for a stroll in central Moscow, and you may run into problems.

Since this summer, Muscovites driving or walking in the centre of the city have complained about the GPS on their phones and other devices going mysteriously haywire - sometimes placing them up to 25 miles away at the city’s Domodedovo airport.

Now one blogger believes he has traced the source of the mysterious “teleportations” : powerful electronic warfare equipment inside the Kremlin.

Grigory Bakunov, an employee at Russian software giant Yandex, spent hours scooting around central Moscow’s streets devices using GPS and GLONASS, a similar Russian system.

In a blog post this week, he said he managed to identify several areas of disturbance around the Kremlin when the devices were subject to “spoofing” - where a device imitating a GPS ‘satellite’ sends out false information to convince devices they were somewhere else.