Russian Letter encoding issue

Hello, I'm facing a encoding issue when using HttpClient request in my Android app.

HttpClient client = new HttpClient();
                Task<HttpResponseMessage> response = client.GetAsync(url);
                Stream responseStream = response.Result.Content.ReadAsStreamAsync().Result;              
                using (var reader = new StreamReader(responseStream, System.Text.Encoding.UTF8))
                {
                    content = reader.ReadToEnd();
                }

I need to retrieve html content from the requested url. I get it in my content variable, but Russian letters could be encoded properly and displayed wrong. Could you please assist me in this. Thank you very much!