“This is us getting our first taste of what it’s like to go up against a serious adversary in electronic warfare,” Humphreys said. “I don’t think Russia has shown all its cards yet.”
https://www.newyorker.com/tech/annals-of-technology/how-vulnerable-is-gps
https://www.newyorker.com/tech/annals-of-technology/how-vulnerable-is-gps