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.
Still not necessarily wise to voluntarily escalate an air war when you have very little air defence. But hey what do I know
That's true, however they don't use this capability like it's infinite. They only utilize this when Russia does something similar or plans of doing something similar leaks.
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.