Foreign spies are being accused of plotting a series of cyber attacks aimed at destabilising Russia's financial system.
The Federal Security Service, known as the FSB, said the computer servers involved in the planned attacks are located in the Netherlands and registered to Ukrainian company BlazingFast.
The FSB said the attacks from unspecified "foreign services" would be accompanied by a stream of text messages and posts on social networks containing claims of an imminent collapse of Russia's major banks and the breakdown of the financial system. It said the action would target several dozen Russian cities.
President Barack Obama's administration has accused Russia of conducting a series of hacks to interfere with the US election, accusations Moscow has denied.