Hi and welcome on here.
To answer your questions.
1. Most Russian universities accept foreign students.
2. The process is basically same for all universities. The difference may only be in the tuition fees.
3. It is true that foreign applicants must complete a Russian language (among other subjects) prep course (usually between 9 months to a year) before gaining full admission. However, if the language of taught is in English, then you may not need to go through this.
4. For specifics, best you contact the University/faculty you are interested in.
For GUKIT SPt,- See here for the contact
page