Tower is located in South America...

Lol where did you read that? I have read multiple sources based on the mountains and star patterns above the tower its in southeast Asia aka Nepal, at base of the Himalayas. That is also why we are so close to the cosmodrome. Why would the tower need to push back fallen that are on the exact opposite side of the globe?

What makes you think the Tower is close to Old Russia? Also a quote from the Cryptarch: "Civilization once stretched from the southern tip of this continent to the frozen north". You could be right, considering Asia does have a frozen north and a southern tip, but there is not enough evidence to prove either point. I guess I shouldn't have straight up said the Tower is in South America. There is no proof of the Tower being anywhere near the Cosmodrome though

Going off the cryptarch quote you can assume several things. Made dawned from Africa, which has a southern tip but no frozen north. South Africa has no frozen north, unless you count north america as its north. But the civilization of man did not begin in the Americas. This leaves Asia, with a frozen north (Russia) and a southern tip (India). However, the cryptarch says civilization existed there. Not originated, and not this one specifically. Humanity coveted the globe. At it really says is the continent we may be on right now has a southern tip and a frozen north But to answer your question. I believe the tower is close to the cosmodrome because of one sole reason. Why is the cosmodrome the front lines of our defense of earth? The place where we need to push back the hive and the fallen first and foremost? It would male sense if it is nearby. What is the farthest place in the world from Russia? Probably somewhere in south america. What is close to Russia and has giant snowcapped mountains? Nepal

South America has giant snow capped mountains too, the Andes. You do make some good points though