“Heartfelt conversation” with the investigator is not part of your duties, therefore you can refuse to answer questions about your personal and intimate life or chitchat about the weather and nature. The investigator is on duty, and you have enough rights to not get into the traps that they laying out for you. And if you notice, that you said one thing and something else is written in the protocol, you do not have to sign it (Article 189, Code of Criminal Procedure). You can directly say, that you wish to draw diagrams, drawings, paintings and write the document independently– to fixate on clear questions and give them answers.
There are a lot of practicing lawyers in Moscow; you can find an attorney on the internet, through ads or advertising brochures. However, not all of them will be willing to determinately fight for your rights. I have, unfortunately, heard many times that the lawyers in Moscow only are interested in the fee. But I know that it is not the case, me being the primary example. For me, the priority lies in offering professional assistance and provide juridical services to those who need it.
If you need the help of an attorney in Moscow (lawyer in Moscow, attorney in Moscow, barrister in Moscow), you can call me anytime. I will do anything possible to prevent a tragedy from occurring. There are no deadlocks, one must just find another way from another angle, fight till the last, and not give up!