What we read as anger is in fact often only the raised volume and close distance of a personal conversation. Russians need to know this is why foreigners seem so jumpy when they first arrive. Naturally foreigners are imagining that you are either trying to lift their wallets by being so close, or are attempting to start a fight or begin a seduction. This means Russians also appear forbiddingly angry to Americans even when they say nothing at all. Americans in turn, often appear to be vulgarly laughing at strangers when they automatically smile at people on the subway.
Eye contact is also different from culture to culture.
Russians, often seem to be staring rudely by Western standards of eye contact which allows for little or no contact between strangers. In 1993 I brought over a group of American students to Russia. The problem is that Russian Personal distance lies within an American's Intimate distance, just as American's Personal distance lies within Northern Europe's Intimate space. The result is that Russians seem pushy or over-amorous to Northern Europeans, and Europeans seem cold, and unfriendly to Russians. Americans, existing somewhere in the middle, manage to equally offend both parties, for opposite reasons.