“...since Russia itself seems to have no defense system to respond to those kind of strikes...”
Apparently, you been sleeping under a rock for the past few months as the Russians just hammer missile and drone strike Ukrainian energy, etc. infrastructure?
Ukraine likewise has no “defense system to respond to those kind of strikes”?!
“Ukraine likewise has no “defense system to respond to those kind of strikes”?!”
Actually, that’s false. Ukraine has already received some systems capable of defeating drone strikes, they just don’t have enough to cover the whole country. Still better than Russia’s situation, since Russian has zero capable defense systems and a much larger area they need to defend.
I bet Ukraine had help from MI6 or CIA or who knows. But, in the end, this will only make things worse for Ukraine. What if Russia get so angry that Putin blows up the whole of Eastern Ukraine with Nukes or Vacuum Bombs? Would the US launch a nuke strike and risk total Nuke war—and the end of everything—I think Not.