Ukraine has been at war for 4 years. They didn’t have the capability to hit Russia this hard and deep until fairly recently. These are mostly home grown weapons developed during the war.
I'm not a fan of wars, regardless of where they happen. OTOH, I still believe you can fight relatively clean or be an unethical bully. If the war is unavoidable, I prefer to be the former.
I also commend Ukraine's ingenuity and bravery, as well.