which is available to the public, could theoretically be made unavailable to users at any time. 114 This vulnerability is one reason why the former Soviet Union and the EU developed homegrown alternatives ew/Article/2999161/beidou-chinas-gps-challenger-takes-its-place-on-the-world- stage/#endnote-101> 114 Ibid. 115 GLONASS development began in the Soviet Union and the system was partially functional by