Electronic warfare 

Russia blamed for crashing Swedish air traffic control to test electronic warfare capabilities

Sources in the Swedish government have blamed Russian intelligence for causing a major cyberattack on Sweden's air traffic control system that lasted for at least five days in November 2015, allegedly due to Russia testing out its electronic warfare capabilities.

Between 4-9 November 2015, hundreds of domestic and international flights were grounded at multiple airports across Sweden due to its air traffic control system going offline. The attack caused the radar systems to stop working, which made the computer screens to go blank. This meant that air traffic controllers were unable to see any aircraft on their screens at all.

At the time, the Swedish Civil Aviation Administration publicly blamed a solar storm for knocking out air traffic control systems, which also impacted radar stations in Norway and Estonia. According to a Swedish military leaks news site, however, the real story was much deeper.