,,Should a Ukrainian offensive fail with heavy casualties, a Russian counterattack would capture a lot more territory,,: Ilon Mask

The flower of Ukrainian and Russian youth have been dying in trenches for a long time with almost no territorial gains.

Whichever side goes on the offensive against heavily entrenched positions will lose far more soldiers. Moreover, Russia outnumbers Ukraine ~4:1, so would win a war of attrition even if casualties were equal.

Should a Ukrainian offensive fail with heavy casualties, a Russian counterattack would capture a lot more territory. This is why there has been no major offensive.