They say that Ukrainians can spot a foreigner from a kilometre away. This fact alone will not automatically make you the target of crime. Ukraine is, in fact, a rather safe place. As in most cities, flashing large amounts of cash can cause trouble. Wallets are known to disappear in public transport crowds, so guard your pockets at all times. Being very drunk and/or loud on the street is always a good way to attract unwanted attention, especially from the police. By the way, it’s a good idea for foreigners to carry at least a copy of their passport and visa with them at all times.