I already bought the ticket from shanghai to Paris via Moscow. First do I need visa? I will be there less than 2hours for transit. And this is big question.

My flight is back to 09th of OCT from Paris to shanghai via Moscow.
I wanna delay my schedule one day. So I’d like to know 10th of OCT is there any possible set for me. I already sent email to shanghai office but no one replies and I called bunch of time. Just say back line is busy. pls let me know asap..
thanks.