Business Insider:
Russia wants to hide its most sophisticated air defense missiles from U.S. spy satellites and spy planes by using containers that block the emission of electromagnetic pulses caused when operating electronic equipment, a Russian newspaper reported on Tuesday.
Citing an anonymous Ministry of Defense source, the Russian newspaper Izvestia said the S-400Triumf (NATO designation: SA-21Growler) and the newly developed S-500 Promethey will receive special containers designed to the block side electromagnetic interference (EMI). The missiles, their launchers, radar units, command vehicles, and other vehicles essential to the weapons systems will be placed in the containers.
The article also described “booths” that could house personnel. All of the containers would be in different lengths and weights sufficient to hold vehicles and men.