USS Donald Cook incident

Claims

 * What frightened the USS Donald Cook so much in the Black Sea? - VOLTAIRE NETWORK | 8 NOVEMBER 2014

Reliable sources

 * Russian warplanes reportedly ward off US destroyer in Black Sea - RT - May 30, 2015
 * ''"Apparently, the Americans have not forgotten the April 2014 incident when one Su-24 practically 'blacked out' all of the electronics on board the newest American destroyer Donald Cook," the source said.
 * According to documentary film Crimea-the road to the Motherland (Крым. Путь на Родину), Russia deployed in Crimea modern coast defense missile system Bastion, and made sure it is visible from space. They than illuminated Tomahawk-equipped Donald Cook, with Crimea in the range, with "Bastion" radar. At that point, Donald Cook turned back. According to Putin interview in the film, low-flying overflight was a local initiative and he was not informed; he described it as  'children play '/'hooliganism'. Some sources say SU 24 was unarmed.

Russian EW capabilities

 * Russian Jamming System Blocks All NATO Electronics Inside Bubble 600 Km in Diameter over Syria - Webster Tarpley, October 17, 2015
 * Russia’s Winning the Electronic War - Paul McLeary, Foreign Policy, October 21, 2015
 * ''In Ukraine and Syria, Russian forces are using high-tech equipment to jam drones and block battlefield communications -- and forcing the U.S. to scramble to catch up.