Is it true: Russia authority req'd, ordered their people must carry cash $2700.00 US Dollars to travel to USA?

I've knew a Russian lady thru online Relationship exchange, now she try to convince me that she couldn't buy airfare ticket w/o proof of carry large sum of $2,700.00 Dollars (for 90 days travel/visit USA: $30.00 living wage/expenses req'd during the Visit! Her authority said USA is poor country now, so she stated! ) in cash on hands (during the flight, and will give it ($2,700.00) back to me, once she arrived at USA's Airport!) she must have it to show, proved to authority as req'd, ordered for approval to allow purchase airfare ticket ?! I've asked for her Visa-Pport's proof(I've already paid, sent $391.00 for it, and paid/sent $841.00 for her airplane ticket too! thru Western-Union), but she ignored my inquiry w/ excuses as couldn't sent it w/o equipment req'd, yet I've had rec'd 12 clear beatiful 8"X11" of her !before! I sense it's seem not an authentic attitude: could it be as I'm being "Scam"?!? Wish you could help! Her E-mail website "Nadya"<...@Yandex.ru> Thanks a lot! :*