The core 4-person Estonian technology development team of Skype, via their VC firm Ambient Sound Investments, has made their third investment, this time into a radio communications firm Modesat Communications. The core technology of Modesat is meant for satellite communications and has been developed in Byelorussia, a country with strong Soviet background in military and space technologies.
One of the patent applications of Modesat shows a bit of what they are doing. Searching the web for Leonid Letounov shows some other related stuff.