Civ POV: Is there any proof of Ukraine bombing Russian/Ukraine civilians in the occupation zone after 2014?

In arguing the justifications for the Russian invasion, I’ve parroted this point that Ukraine was bombing towns in the eastern occupation zone and killing civilians.

What I’ve been told is that this is pure fabrication by the Russian government. I only made the claim because I’ve seen videos here of artillery/cluster munitions hitting parks and residential areas in Russia since the war started.

So my question is, is there proof of Ukraine targeting civilians or even their own people in the occupation zone , or is it in fact “Russian propaganda”?

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