The whole reason this operation is happening is because Ukraine kept shelling civilians in Belgorod, so your response is that Ukrainians should be supported in continuing their attacks on Russia? Wow.
Right, because there are no Russian military bases and training grounds in Belgorod.
Local residents of Russian Belgorod showed a video of a Russian Grad MLRS firing toward Ukraine from a road on the outskirts of Belgorod.
Video of Russian Grad firing Toward Ukraine on Civilian Road in Belgorod