Even if one were to grant that Russia is not nearly-indiscriminately shelling Ukrainian cities (which I don't), there is no justification for them to be attacki

Even if one were to grant that Russia is not nearly-indiscriminately shelling Ukrainian cities (which I don't), there is no justification for them to be attacking the country at all, targeted or otherwise. Whatever Putin might say, and notwithstanding ludicrous sham elections in occupied regions, Ukraine is a sovereign country with a democratically elected government, and not a part of Russia to be liberated.