In a scathing attack on the Obama administration, American whistle-blower Edward Snowden has alleged that he has been left as a "stateless" person by the US because of no fault of his.

The 30-year-old former US spy agency contractor, who has been on the run since releasing secretive NSA documents, is currently stranded in the transit zone of the Moscow airport after leaving Hong Kong.

"The Obama administration has now adopted the strategy of using citizenship as a weapon. Although I am convicted of nothing, it has unilaterally revoked my passport, leaving me a stateless person," Snowden wrote in a letter which was posted on the Wikileaks website.

"Without any judicial order, the administration now seeks to stop me exercising a basic right. A right that belongs to everybody. The right to seek asylum," he wrote in the letter. Edward wrote that one week ago he left Hong Kong after it became clear that his freedom and safety were under threat for revealing the truth.