Yes, the more space Ukrain troops occupy, the more targets for Russian missles. Yet, the more missles Russia then needs. It forces Russia to try to retake space it thought it already held, space it once took at great expense.
Nice thought, but it also brought the remnant of capable Uke troops out of their holes and into a kill-box.
Didn't help that they announced their "offensive" weeks in advance so everyone could prepare, but necon morons gotta moron and fight wars through western media.