The last thing I want to do as a writer is offend anyone. Im currently researching for my next novel- a post apocalyptic fiction- and I'm trying to find ways to skirt around an issue.

In the novel, a country has bombed US. I want to specify the country but I don't want to offend. For example if I say North Korea started a nuclear war am I open to be sued? Haha.
I'm probably looking way into it but how can I mention a country without mentioning it? I hope that makes sense. I don't really want to make up a fictional country but might have to.