With Snowden believed to be stuck at a Moscow airport, mysteries about his case abound

MOSCOW — National Security Agency leaker Edward Snowden arrived in Moscow on an Aeroflot flight from Hong Kong on June 23, according to the airline, but he has been out of the public eye and his circumstances and plans are murky. Snowden is believed to have remained in the airport's transit zone, caught in legal limbo after his U.S. passport was annulled by Washington. Here is a look at some of the mysteries surrounding the case of the world's most famous fugitive.

WHY DID SNOWDEN LEAVE HONG KONG?

The Hong Kong government was believed to be trying to persuade Snowden to leave in order to remove a major irritant in relations with the United States. And Snowden apparently feared that the government could hold him in custody if he stayed and fought a U.S. extradition request.

Albert Ho, a local legislator, said he inquired on behalf of Snowden whether he could remain free pending the outcome or leave Hong Kong if he chose to do so. Ho said officials never got back to him with an answer, but an intermediary who claimed to represent the government sent a message to Snowden saying he was free to leave — and should do so.

WHY RUSSIA?

President Vladimir Putin relishes defying the United States, accusing Washington of trying to dominate global affairs. When Snowden was still in hiding in Hong Kong, Putin's spokesman said Russia would consider granting him asylum if he asked for it.

Snowden could have seen Russia as a safe haven that would not send him to the U.S. under any circumstances. Putin so far has met his expectations, bluntly rejecting Washington's expulsion request.

Putin says Snowden remains in the transit zone of Moscow's Sheremetyevo Airport and hasn't crossed the Russian border, a statement repeated by other Russian officials. Ecuadoran President Rafael Correa told the AP that the country's ambassador had seen Snowden once in Moscow. Hordes of journalists have besieged the airport, including a nearby hotel that has a wing for transit passengers, but none has seen Snowden or talked to him since his arrival and there have been no photographs of him.

Some security experts have speculated that Snowden could be in the hands of Russian intelligence agencies eager to learn the secrets he possesses. Putin has flatly denied that Russia's special services have debriefed Snowden.

WHAT IS SNOWDEN'S RELATIONSHIP WITH WIKILEAKS?

Snowden didn't turn to the secret-spilling website to warn the world of the NSA's massive surveillance program, saying he wanted to deal with journalists whose judgment he trusted about what should be made public and what should be held back.

But it didn't take long for WikiLeaks to adopt Snowden and his cause, jumping in to offer its assistance as a kind of renegade travel agency. WikiLeaks' role as Snowden's unofficial handler doesn't sit well with some, including Snowden's father, who has expressed frustration that the organization may not be giving his son the best advice.

WikiLeaks says its legal adviser Sarah Harrison is with Snowden, "escorting him at all times." Harrison has been equally elusive. WikiLeaks said that on Sunday she delivered Snowden's request for asylum to 21 countries, including Russia, to the Russian consulate at the Moscow airport.

HOW DID HE GET STUCK?

WikiLeaks initially said Snowden was bound for Ecuador, where he has requested asylum. He booked an Aeroflot flight to Cuba — presumably as a transfer point — the day after his arrival in Moscow, but he didn't show up and his seat remained empty. The U.S. annulment of Snowden's passport, which has made it impossible for him to legally cross the Russian border or board a plane, could have been a reason behind the change in plans.

He also could have been concerned that the U.S. would force the plane to land while flying over U.S. airspace or felt uncertain about his final destination.

WHO MIGHT OFFER HIM SHELTER?

Ecuador, which has sheltered WikiLeaks founder Julian Assange in its embassy in London for more than a year, has given mixed signals about offering him shelter.

Bolivia, whose president attended a summit of gas exporters in Moscow this week, has been seen as a possible safe haven. The plane carrying President Evo Morales home from Moscow was rerouted and delayed in Austria. Bolivia says it is because of suspicions Snowden was on board, though Bolivian and Austrian officials both say Snowden was not on the plane.

Another potential option is Venezuela, whose president attended the same energy summit in Moscow and made a stopover in neighboring Belarus on Wednesday.

ARE THERE MORE LEAKS COMING?

It's quite possible. Snowden said his work as an NSA systems analyst allowed him to take in a huge range of material, and U.S. officials have given conflicting assessments of how much information he may have had access to. Sen. Dianne Feinstein, the chairwoman of the Senate Intelligence Committee, said she had been told Snowden had perhaps more than 200 sensitive documents.