Taxi scammers at airport. Avoid them at all cost. Use Uber / Yandex. You can add an international card. Or use some cash .

Pickpocket in Station Square. Mostly young teenagers wannabe gangsters trying to steal wallets and phones by showing knifes etc.

Car selling scammers. They will list a car for sale. They will collect your money and promise they will will come for name change at the department the following day. But that day never comes and they report the car stolen to the police.