[PlasmaKrab]

Maybe you can assume some light AFVs were smuggled from the abbandoned factories/barracks or neighbouring countries, with enough spares or sheer faith to hold on for some months.
Small uncomplicated things like EE-11, BTRs, BRDMs, AMLs...

Indeed some ammo was provided (apparently) from vazious countries by various groups and individuals over very unofficial channels.

However you can assume that under embargo the Western hardware will wear out faster due to more sophistication and stronger embargo enforcement.

You can also scratchbuild or copy some guerilla makeshift weapons, like the single-shot rocket tubes you can find in some OOBs.