In St Petersburg there have been reports of street crime where tourists have been specifically targeted. These crimes are carried out by well-organised gangs. Be aware of pickpockets in the main tourist areas and around the main railway concourses.
Bogus police officers have harassed and robbed tourists. If you are stopped always insist on seeing identification. Avoid openly carrying expensive items, or anything that might easily identify you as a tourist. Avoid walking about late at night alone. Incidents of violence in major cities are usually linked to criminal/business activities and are not usually directed against foreign visitors.
There has been an increase in the number of passports reported stolen or lost when in the airports in Moscow. Be particularly vigilant when passing through the airports, particularly in the baggage collection area and outside the arrivals hall.