As I've said, western media tend not to make distinction between the two. In taking of Slavyansk, both army and the National Guard were present. What was the exact ratio, I don't know.
Ukraine can field a rather large with reserves deployed. The fact that they had to resurrect National Guard and that National Guard was involved in pretty much all skirmishes/battles tells me that Kiev doesn't trust the army so much (NG is controlled by the Ministry of Interior Affairs)
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