I believe it was purely for reasons of expansion. I don’t know exactly what our response should have been, but we need to at least acknowledge that Ukraine is defending their sovereignty and Putin/Russia are the aggressors. We should support them at least minimally.
Of course Russia uses conscription as well. In fact don’t most countries that go to war use conscription? I don’t like it but, if we can stop it here then the next country that Russia might invade wouldn’t have to draft soldiers.
I mean it doesn’t seem like too big an ask to require the country you’re arming not to do slavery. If they want the weapons that badly I’m sure it will work.