Launching an attack into the Russian proper would be doing the same like Russia did: launching an…

Ukraine has more pressing needs (i.e. needs the troops in question elsewhere), and is doing better by not attacking Russia.

Launching an attack into the Russian proper would be doing the same like Russia did: launching an aggressive war. And, it would rally even more Russians around Putin. ....and then, the question would be: for what purpose?

Ukraine has more pressing needs (i.e. needs the troops in question elsewhere), and is doing better by not attacking Russia.