The PRC has been distrustful of Japan since the end of World War II, although relations have improved since then. I'm slightly confused with your wording. Do you think China considers South Korea to be a mortal enemy or just Japan?
I said it tongue in cheek (and notice I said "begin discussing") and in a spitefully sarcastic mannor.
But I stand by my point that we should stop playing footsie with the Russians and Chinese over their willingness to allow Iran to go nuclear.
Certainly the US should not give unnecessary nuclear technology to anyone - period, but by discussing the Chetchnia factor, we would be pointing out the huge hypocritical hole the Russians have dug them selves diplomatically in their willingness to stand by and do nothing while crazies in Iran seek to threaten the world with nuclear bombs.
If Russia were to consider that Chetchnia might end up with that lethal nuclear technology, it might change it's mind with regards to Iran.