They do have a professional army.
It’s been in continuous existence since its cadre split from the Soviet army thirty years ago. Its got all the usual army REMF stuff, arsenals, HR, logistics, ordnance, whatever.
It had a regular structure of brigades with garrison towns, etc. It had a conscription system and training system.
It’s expanded greatly, mostly in the “teeth” part, creating many additional brigades. It also called up a lot of militia units. Maybe that last part has misled you.
They are down to conscripts and war fighting aged males are in hiding. If they had a professional army they would have their own weapons and know how to use them. Their troops do not know tactics and do not have experience working together in a coordinated manner. Every time we give them weapons, the weapons are destroyed, whether Bradleys. Abrams or Panthers.