The trick of Russian language is you don’t need grammar at all to be understood. Just learn the words and compile as you please and use intonation to compensate the lack of proper grammar. USSR was a Babylon with about a thousand native groups who had own language each. Most of them had their own ideas on how to speak Russian for communication with other groups based on the grammar of their languages and the rest learnt to live with it. There are no grammar Nazis in Russia.
There are no grammar Nazis in Russia.