From Episode 2×01 Ebb Tide:

Ziggy embarrasses Nick by talking too much and offending Sergei, a Ukrainian driver, by calling him Boris (and Russian)

The Wire is a critically acclaimed show that highlights the end of the American empire through the lens of the Baltimore police fighting the different faucets of crime in their city. This season has an interesting focus on human trafficking, where girls from Eastern Europe are funneled through Turkey to work as prostitutes in America.  A good book on the subject is The Natashas.