Any vaccine is dangerous to do if a person has chronic diseases. Most people in Russia over 55 have chronic diseases, so no one can predict side effects.
Before the vaccination, you sign a special agreement, and if something happens to you after the vaccination, then the medical institution that gave you the vaccine will not be responsible for this.
As far as I know, children are not given the vaccine. Friends were sick with coronavirus, and their children had symptoms of mild colds.
Maybe it's good that there is no vaccine in your country, because it has not yet been tested.
But something needs to be done against COVID 19, right? From your own data (that you posted previously), there have been close to 400,000 excess deaths in the past 5-6 months. This is a huge number, especially for a country such as Russia where the population decline was underway even before the pandemic started spreading. Apart from vaccination, what are the other options?
The Sputnik V clinical trial data is published in Lancet, which happens to be one of the most reputed medical journals out there. It shows that the vaccine has a 92% efficacy against the virus. That means that, if the people were vaccinated from the start, then more than 360,000 deaths could have been prevented just in Russia. So as long as we don't have reports of large number of people dying as a result of vaccination, I am not going to argue against it.