Russia spreads dense net of "invisible killers" in the Black Sea Fleet area

Synthetic aperture radar is a type of radar used to create two-dimensional images or three-dimensional reconstructions of objects. SAR allows satellites to collect images through clouds, fog, and smoke, day and night.

The extent of Russian EW systems used to protect military facilities and weapons can be clearly seen from space. Strong electromagnetic interference has been shown in SAR satellite images.

That means Russia has concentrated its most powerful EW assets on Sevastopol.

Russia's Black Sea Fleet is facing a number of challenges after Ukraine's attacks on Crimea forced Russian ships to move away from the port of Sevastopol, according to the British Ministry of Defense .

Russia's Black Sea Fleet in the city of Sevastopol on the Crimean peninsula has been the target of several recent Ukrainian attacks.

Newsweek estimates that since Russia began its military campaign in Ukraine last February, the Black Sea Fleet has recorded 17 attacks on its ships, including the flagship Moskva and the new frigate Askold.

It can disable any electrical device and can be performed from the ground, air, land, sea and space without the use of explosives or direct hits.