as Borisoglebsk 2. It is postulated that this system has defeated communications in parts of that country, including mobile telephony and GPS systems. Other countries Since the early 1960s, the practice of radio jamming has been very common in Cuba, blocking not only American government funded radio stations (such as Voice of America) but also Ham radio signals, and stations owned and/or operated by (or selling airtime to) Cuban exile groups transmitting from Miami, such as La Cubanisima, Radio Mambi, WWFE La Poderosa and Cadena Azul. The same practice has been applied to Radio y Televisión Martí, operated by the U.S. Information Agency since 1985. North Korea and South Korea still regularly jam some of each other's radio (and sometimes television) stations. Several Middle Eastern countries (particularly Iran) jam shortwave broadcasts (and even occasionally attempt to jam satellite TV signals) targeted at their countries. Pakistan has contemplated jamming pirate radio stations operated by the Taliban in all jails across Pakistan. This decision has led to an outcry from Pakistani cellular operators, who state that most of the jails lie in urban areas with a resultant impact on the cellular service of all operators in the adjacent area of jails. Ethiopia has jammed the DW and VOA transmissions as well as ESAT Ethiopian Satellite Television and Eritrean radio stations. Vietnam jams the Vietnamese service of Radio Free Asia, Radio Đáp Lời Song Núi, some FEBC programs, mostly in Vietnamese Minority languages as well as Radio Sweden with a "siren" jammer and "bubble" jammer on FM Frequencies. In Nigeria, the Nigerian Broadcasting Commission has claimed jamming signal of Radio Biafra. In South Africa, the use of wireless signal jammers is illegal. There is a single exception to this rule. South Africa's State Security Cluster may, in certain instances, employ signal jammers. In fiction Radio jamming (or "comm jamming") is a common plot element in the Star Wars franchise. In Star Wars: Episode VI - Return of the Jedi, when the Rebel fleet approaches the Galactic Empire's force, believing themselves to be launching a surprise attack, General Lando Calrissian realizes the Empire is jamming their signals, and therefore know they are approaching. In the film Star Trek II, after receiving a distress call from the space station Regula I, Captain Kirk attempts to establish communications, but the Enterprise's comm officer Lt. Uhura reports that further transmissions are "jammed at the source". See also