First off let me tell you I am 150% friggin jealous of you, going to MOSCOW. That is on my top list of places I want to go to, oh my god, I am so jealous of you .
To be more helpful: I actually love flying, obsessed with jets even, but I remember the first I flew as a kid I was horrified beyond belief. I kept thinking of the fact the plane was an object in the sky, flying thousands of feet in the air and the sensation made me sick. What I did to help was just shut my eyes, count really slow, just keep them shut, count again, then re-open. DO NOT GET A WING SEAT. If you get one try to switch up, for some reason seeing the blinking beacon makes me feel more scared because it gives you this sense of vertigo.
Its an awesome thing if you can get over your fear of flying though. The world is at its most beautiful through the window of an aircraft, everything imperfect and dirty is transformed into this perfect panorama of scenery. The best flight I ever had was a night one from Miami to Lima, Peru. The sky was so beautiful and I remember seeing so many cool little things. God I love flying now, I'm truly sorry from the bottom of my soul for your fear. Try to overcome it and think of all the awesome things you could look out your window and see if you weren't scared!
Sorry if this only makes things worse.