Embassies of at least six countries, including the U.S., received emailed threats from “skinheads” warning foreigners to leave the country or face attacks. Two Americans were assaulted in March in the southern city of Krasnodar, and others were harassed recently in Moscow, including at such major tourist sites as Red Square and the Arbat pedestrian mall. Steer clear of these individuals, especially groups of them. Skinheads here usually target dark-skinned people.