You should get ovf permits easly, if you are patient enough and apply well before ( 3-4 days )
but landing, you must get first slots then you will apply for Russian CAA. Did you apply for slot first ? if not try this way, and be kind on phone as CAA is super busy or not willing to speak much in a language other than Russian.
if not at all, then give up and try local agents as streamline,rusaero,aerotrans
