They are COALERs, but neither the armed one or the AEW one are An-74s. The -74 is the dedicated high-power polar version, and as far as i know only comes as An-74.
The basic aircraft is the An-72, and a variant of this is the An-72P patrol aircraft. This is the armed version, usually with rocket pods under the wings and a twin 23mm cannon pod on one of the landing gear sponsons. Ukraine and Russia both have a small number of An-72Ps in service for border and coastal (think fishery and stuff) patrol.
The AEW (or DRLSBO as the Russians would say) is the An-71 MADCAP, which was originally intended for use from the full-size Soviet carriers. The project was cancelled after three built (but only two completed) airframes, in favour of the Yak-44 of which only a mock-up was completed before that was cancelled.
If you wait a bit for Flanker_Man, he built a wonderful model of the An-71 and the building description gives a nice bit of info on the aircraft. He probably has a bunch of pics of both the -71 and -72P from his own collection too.
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