VEVAK
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The general consensus is that this test was very likely of a single chamber variant of an RD-250.Thats the reason why you`re seeing the turbopump exhaust as the original 2 chamber design used a common turbopump for both chambers.
This is in fact a closed cycle oxidiser rich engine,and a rather powerful one at that.Hopefully iran will acquire this engine,if it hasnt already,as this would enable iran to basically do pretty much whatever it wanted in rocket/missile terms ie build irbms,icbms as well as slvs capable of putting multi ton spacecraft into low earth orbit.
I dont know how the dprk got its hands on this but it is an incredible achievement,lets hope that iran gets to make use of it as well.
http://www.b14643.de/Spacerockets_1/Rest_World/Unha-X/Gallery/Engine.htm
More like a gas generated power cycle like the Merlin engines used by Space X