And what? A tattooed one? Naaah. 
Actually, it's entirely in keeping with his character. The original Zukovsky was a KGB mastermind turned gangster; since the Cold War has been over for twenty years, the new version has clearly dropped the KGB aspect and played up the criminal side of things. Zukovsky's tattoo is a Russian criminal one, usually a mark of the
vory v zakone and it's unlikely that it's his only tattoo. Almost all Russian criminals - at least the ones who have been in prison - will carry tattoos of some kind, because they tell their life story. If you know how to read the language of the tattoos, they will tell you everything you need to know about a man at a glance: who he is, where he comes from, how long he has been inside and his crimes (committed both inside and out of prison), his sexual orientation, his standing within the criminal community, his debts, his trustworthiness, whether he would be willing to take part in a prison escape and so on. I'm certainly no expert, but even if I was, I couldn't identify his tattoo (much less its intended meaning) if I tried. But I'm willing to bet he has more than one. The first tattoos usually go on the fingers between the knuckles and identify the basics like age, ethnicity, place of birth and alleigances.