This is what I judge from the context.

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Note added at 9 hrs (2015-11-30 00:22:51 GMT)
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About 20 Su-24 bombers and Su-24M tactical reconnaissance aircraft are fully operational. One of these aircraft of the Soviet-era crashed upon landing in 2014, with its crew surviving after ejection (Image © Ukrainian Ministry of Defence)
http://airheadsfly.com/2015/01/04/ukraine-military-planning-...
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Combat helicopters (Mi-24s / armed Mi-8s): about 20 to 40 of an official 72 fully operational. A total of 121 attack helicopters with all choppers in reserve/mothballed included Artillery guns: 716 (but many not operational)

http://airheadsfly.com/2014/03/01/overview-air-forces-ukrain...
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Ukraine also had 66 examples of Su-27 Flankers, respectively 40 Su-27S Flanker-B’s (which are capable of conducting air-to-ground sorties), and 26 Su-27P Flanker-B’s (interceptor variant) and Su-27UB Flanker-C’s (two-seater). 36 of these were to remain in active service, while 16 were to be fully operational.
http://theaviationist.com/2014/12/02/analysis-of-ukrainian-a...