You can't cancel a transaction without the buyer's cooperation

I found out that a sale I have will eventually be shipping out of the US. The shipping address is to CA, but it will ultimately be shipped to Japan. I do not ship internationally and want nothing to do with this transaction. I was wondering if I can cancel the transaction without an issue. The buyer has not paid yet. There is not an option for this type of cancelation request. Will I be penalized if I choose an Other Reason and explain I do not want to be affiliated with a 3rd party? Thanks in advance.