I think that in general Russians are pretty hospitable and friendly, but still there are things
which you should be aware of. First of all, there are no strict rules for this or any restrictions,
but Russians hate it when people speak loudly on the phone. There are Russians who
speak loudly in public, too, but it usually attracts a lot of unwanted
attention. Nobody wants to know what you are talking about with your friends or
relatives. Secondly, if you see drunk people fighting with each other — do not
stare at them! It’s simply dangerous because they would probably want to fight with you
as well and they wouldn’t be afraid of the consequences because there is no strict law
which would stop them from punching you in the head/face, too. I think it’s pretty
much everything/all you should know before you travel to Russia. I’ve met many
foreigners and never heard them complaining/complain about serious difficulties in
communication with Russians.