And actually, nukes are part of the reasons we won’t do much. Not only western nations aren’t keen to send their kids dying in Ukraine. But Russia has nuke. A nuclear power engaging an offensive inside the territory of another nuclear power is a big risk of nuclear escalation. Remember the missile crisis in Cuba ? US officers considered a preemptive nuclear strike.
Nuclear power fight each other by proxy. See how NATO provide weapon to Ukraine, or how Wagner mercenaries attacked french troops in Africa.