"If I have time to go through this information, I would like to make it available to journalists in each country to make their own assessment, independent of my bias, as to whether or not the knowledge of US network operations against their people should be published."
His decision to leave Hong Kong reportedly came after an "intermediary" from that Government told him authorities could not guarantee he would not be jailed while awaiting trial.
The US has demanded that Russia hand Snowden over.
President Barack Obama said the US was using "all the appropriate legal channels" to apprehend him.
White House spokesman Jay Carney said Washington assumed he was still in Moscow, and had registered its "deep disappointment" with Hong Kong and China for letting him slip away. Last night Russia called US demands for Snowden's extradition "ungrounded and unacceptable".
Julian Assange, the WikiLeaks founder, said his organisation assisted Snowden in his flight.
Asked whether it was not surprising a champion of freedom of expression should ally himself with China, Russia, and potentially Cuba or Ecuador, Assange said: "I do not see the irony.
"Mr Snowden has revealed information about mass unlawful spying that has affected us all," he said. Telegraph Group Ltd, AP