To justify its decision the Biden administration even 'leaked' an intelligence assessment which warned of allowing such:
Intelligence agencies concluded that granting Ukraine’s request to use Western missiles against targets deep in Russia could prompt forceful retaliation while not fundamentally changing the course of the war.
Reality asserts itself like a brick to the face. lmao
So, even less effectively from a military standpoint. This shit has never worked - not in ww2, not in Korea, or Cambodia, nor in Vietnam. Fucking fascists are born losers