If that is true, he's a complete moron. He wasn't the one fighting in that war, so why would he be the one getting a tattoo? And how the hell are people gonna react if he decides to visit Bosnia or Serbia? I think (HOPE) that someone made the whole story up.
If the story is true, then I blame Zoe.
In an interview she was asked about her tattoos and she referred to them as 'just doodles'. WTF!! You doodle on a piece of paper not on your body! I'm a huge fan of tattoo art. I thought about the ones I have on my body for months and sometimes years. It's never a good idea to be spontaneous with ink.