So the problem is logistical. Ukraine has a major logistical problem holding a third of its territory, should they give it up?

Also, again, using your argument. Why doesn't the US give away all its territory that they conquered during centuries? Do you think the Arabs that invaded northern Africa should also go back to where they belong?

You sound like someone who has zero self awareness and even less history knowledge.

Not even the UN considers Ceuta and Melilla as colonies or occupied territories.