Thank you, Romelle & Antonio8069 for your insight.
Yes, I am American, I can try to avoid connection in Russia if so, to reduce any visa implication. although is it ready a problem if I will only have a connection flight there from some reason? Not planning to go explorer the city.
Going to give a try to Star Alliance RTW. From my google research on airteks it seems like a legit company with current customers. Would be great if anyone can confirm and share their experience from this forum.
Have all a great and peaceful weekend!