My understanding is the bases targeted are far away from the front lines. They keep the large, strategic aircraft here because (1) they out of range of conventi

My understanding is the bases targeted are far away from the front lines. They keep the large, strategic aircraft here because (1) they out of range of conventional missile/drone attacks (2) they still have the range to make the trip to the front and back (3) these aircraft are largely launching missiles that fly hundreds of miles (so they don't actually need to be too close to the front). The smaller aircraft tend to be closer to the front.