Law, Power, and Justice

From a strictly military perspective, restrictions never help. Giving Ukraine the means and permission to launch attacks deep into Russian-held territory would surely improve Ukrainian combat power. But the difference is unlikely to be decisive. To achieve a game-changing effect, Ukraine would need to combine these strikes with tightly coordinated ground maneuver on a scale that its forces have been unable to master so far in this war. Otherwise, the benefits Ukraine could draw from additional deep strike capability would probably not be enough to turn the tide.
— Read on www.foreignaffairs.com/ukraine/false-promise-ukraines-deep-strikes-russia

NOTE: this line of argument has plagued Ukraine from the beginning of her second invasion. It has been deeply controversial.