"Time may be running out for U.S. fugitive Edward Snowden to get out of Russia."

"The former National Security Agency contractor has been holed up in the transit area of Moscow airport since Sunday, but Snowden may only have been given a Russian transit visa valid for three days...."

"Transit passengers who have a ticket for a connecting flight and documents necessary to enter a third country can get a Russian transit visa.... If Snowden has these documents, then he has the right to apply for a transit visa right in the airport, in the consular point, and could well have done that."

This sounds like the boring part of the movie "Casablanca." Why can't he get another transit visa?