By 1976 a major modernization of USAFE was necessary. The Soviet Union's new generation of MiG and Sukhoi fighters made NATO military planners anxious. Indeed, intelligence reports about the MiG-25 left little room for comfort; the performance of this latest Russian combat aircraft was far superior to any NATO aircraft. The twin-engined MiG-25 reached speeds of over 3,000 km/h even at high altitude (over 70,000 feet) and it could be armed with radar-guided AA-6 Acrid air-to-air missiles. When the Soviets stationed large numbers in the Soviet Union and later in the GDR, NATO had to address this problem.