I think the reason Ukraine has not attacked Moscow with missiles is that this would force Russia to retaliate with nuclear missiles. There's a long discussion on this in sources I follow (full disclosure, I tend to listen to John Mearsheimer a lot although I don't believe everything he says) and the consensus is that the latest attacks in Russian land will have consequences.

So I agree that it's not so simple but I also don't believe for a minute that it has anything to do with ethics. Not in that war. And I have to be honest but I can't think of a war were ethics played an important role in determining belligerent's behaviour.

Russia been saying they will nuke everyone since before the war. They never do anything when meet with strength. Russians even didn’t use nukes when Russian land was under occupation for months. They just raised their fist in the air shaking it and said ”we will show you”.

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