Mikoyan-Gurevich MiG-17F, part five, Romanian and Soviet users

The Mikoyan-Gurevich MiG-17F was also used by every Warsaw Pact country member. Among them Romania and the USSR, as expected.

• Romania: In 1952 the People's Republic of Romania received a batch of 48 MiG-17Fs which were delivered in three stages with the last one being delivered in 1955. When, in 1958 the first MiG-19s were delivered, they were gradually withdrawn from active fighter service and sent to ground support duties, although they were technically never used in combat. During the 1960s some of them were still active and they were kept in active service with the Romanian Air Force until as late as 1992 when they were written off.
• USSR: The MiG-17F was designed for interception of enemy bombers, and not for dog fighting. As it's a subsonic fighter, it was effective against slower (0.6-0.8 mach) heavily loaded American fighters, as well as the main American bombers during its development period in the early 1950s like the piston-powered B-50 Superfortress or the Convair B-36 Peacemaker which was mixed jet and piston-powered. The MiG-17F (which composed the bulk of every Soviet Air Arm during the early-to-mid 1950s) wasn't however able of intercepting the newer generation of bombers that appeared in the mid-1950s like the Avro Vulcan or the Handley-Page Victor as they could flight higher. As the USAF introduced strategic bombers capable of supersonic dashes like the Convair B-58 Hustler or the General-Dynamics FB-111 in the early 1960s, the MiG-17 was rendered obsolete for front-line PVO (Soviet Air Defence Forces) service and they were replaced in that service branch by the MiG-21 and MiG-23.
  In 1958 PVO's MiG-17Fs shot down an American reconnaissance Lockheed C-130 Hercules that was flying over Armenia causing 17 casualties and, during the Prague spring in 1968, the Soviet Forces destined there, used MiG-17Fs to flight over Czechoslovakia.

Sources:

1. https://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-17#Operators

2. https://en.wikipedia.org/wiki/Soviet_Air_Defence_Forces

3. https://en.wikipedia.org/wiki/Romanian_Air_Force

4. http://www.aeroflight.co.uk/tag/romanian-air-force

5. Salamander Books - The Complete Book of Fighters