Fernando Belaúnde Terry. Velasco aligned Peru more closely with the Soviet Bloc and relations with the United States deteriorated. The US declared an arms embargo in 1969, making it difficult to obtain spare parts for Peru's American weaponry. In the 1970s and 1980s, Peru turned to the Soviet Union for its military hardware. During this time, the FAP acquired several Soviet-made aircraft, including Sukhoi Su-22 fighters, Antonov An-26 and An-32 transport aircraft, as well as Mil Mi-8, Mi-17, Mi-25 and Mi-26 helicopters. Soviet advisors were also dispatched to Peru. Velasco was overthrown by other military officers in 1975 and Belaúnde returned to power as a civilian president in 1980. The FAP purchased the French-made Mirage 5P and 5DP and the Mirage 2000 in 1984. Relations improved with the United States and the FAP obtained American aircraft like the Cessna A-37B Dragonfly attack aircraft, as well as Lockheed Corporation C-130 and L-100-20 Hercules transport aircraft. Stagnation The stagnation of the Peruvian economy during the late 1980s and early 1990s forced cost reductions and the downsizing of the fleet size. Budget cuts in training meant Peruvian pilots had a low number of annual flying hours (AFH) per pilot if compared to the 1970s. The number of annual flying hours is of course very important in estimating the individual skill and experience of the pilots of an air force: more annual flying hours suggests better trained pilots and general readiness. There are also a number of possible explanations for FAP's low AFH: concern over the aging of equipment, scarcity of spare parts – especially for the older aircraft – difficulties with worn airframes and the scarcity of fuel are all contributing factors. It is very likely however that some 'elite' pilots and regiments such as those based in Talara AFB and La Joya AFB received considerably more flying hours. Especially since those regiments until today are equipped with modern aircraft and tasked with homeland defence. Cenepa War The Peruvian Air Force participated in the 1995 Cenepa War against Ecuador's Air Force in the Amazon Basin. It provided aerial support to the Peruvian army, carrying out bombings with Mi-25 helicopters, Canberra bombers, A-37 and Su-22. Due to a lack of reliable roads, troops were transported by Mi-17 helicopters, L-100 Hercules, An-28 and An-32. During the course of the war, at least two helicopters were shot down. Fujimori government In 1997 and 1998 the FAP's