Edward Snowden: US angry at Russia and China
The US has criticised Russia and China after fugitive Edward Snowden left Hong Kong for Moscow.
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President Barack Obama said the US was pursuing "all the appropriate legal channels" in pursuit of him.
US Secretary of State John Kerry has said it would be "disappointing" if Russia and China had helped him evade an attempt to extradite him.
Mr Snowden, who has applied for asylum in Ecuador, is believed to still be in Russia having flown there on Sunday.
White House spokesman Jay Carney said he did not believe Hong Kong's reasons for letting him leave.
The US has revoked Mr Snowden's passport, and he is thought to have spent the night in an airside hotel at Moscow's Sheremetyevo airport.
On Monday, a seat was booked in his name on a flight to Cuba, but he was not seen on board when it took off.
The 30-year-old IT expert is wanted by the US for revealing to the media details of a secret government surveillance programme, which he obtained while working as a contractor for the National Security Agency (NSA).
He is charged with theft of government property, unauthorised communication of national defence information and wilful communication of classified communications intelligence.
'Deliberate choice'
Mr Obama briefly mentioned the case at the White House on Monday, telling reporters: "What we know is that we are following all the appropriate legal channels and working with various other countries to make sure that the rule of law is observed."
Speaking during a visit to India earlier, Mr Kerry said it would be "deeply troubling" if it became clear that China had "wilfully" allowed him to fly out of Hong Kong.
Source: BBC