Russia is winning the electronic warfare fight against Ukraine — and the United States

U.S. ground forces have become incredibly dependent on electronic communications without taking adequate steps to protect them from sabotage.
https://www.nbcnews.com/think/opinion/russia-winning-electronic-warfare-fight-against-ukraine-united-states-ncna1091101

General reveals that US aircraft are being 'disabled' in Syria — the 'most aggressive' electronic warfare environment on Earth - Business Insider

The commander of US Special Operations Command said that Syria has become "the most aggressive electronic warfare environment on the planet from our adversaries." General Raymond Thomas stated that US communications are brought down and that aircraft, specifically the EC-130, have been disabled. ....
http://www.businessinsider.com/syria-electronic-warfare-us-planes-disabled-2018-4