Russia has the best air defense in the world. C-130 is a big slow moving target. Even in Afghanistan they operated only at night.

What, are there Russian hospitals in need of bombing? C130 can’t operate if there is air defense

They had gunships in Afghanistan and US still lost, not sure I see your point here. Not to mention the Taliban didn’t have close to the anti-aircraft capabilities that the Russian military has. AC-130s work fine for bombing defenseless hospitals, but against a force with radar, electronic countermeasures, anti-aircraft missiles, fighter jets, and all the other tools that a modern military has access to? I think the gunships would not be nearly as effective as you think