On Tuesday evening, Maduro again spoke out in support of Snowden, without giving any more indication of whether he would help him leave Russia.

"Who must protect Snowden? This is the question. This young man of 29 was brave enough to say that we need to protect the world from the American imperial elite, so who should protect him?" Maduro said in response to a question from journalists covering a ceremony to rename a Moscow street after Chavez. "All of mankind, people all over the world must protect him."

Maduro was scheduled to spend Wednesday in neighboring Belarus before returning to Venezuela.

Snowden, who recently turned 30, withdrew a bid for asylum in Russia when he learned the terms Moscow had set out, according to Putin's spokesman Dmitry Peskov. Putin said on Monday that Russia was ready to shelter Snowden as long as he stopped leaking US secrets.

At the same time, Putin said he had no plans to turn over Snowden to the United States.

Snowden has applied for asylum in Venezuela, Bolivia and 18 other countries, according to WikiLeaks, a secret spilling website that has been advising him. Many European countries on the list _ including Austria, Finland, Ireland, the Netherlands, Norway, Spain and Switzerland _ said he would have to make his request on their soil.

Polish Foreign Minister Radek Sikorski, whose consent for asylum would be required, said in a message posted on Twitter that he would not grant the request. Germany's Interior Ministry specifically ruled it out too, saying that "the conditions to take him in are not there."

WikiLeaks said requests have also been made to Brazil, China, Cuba, Ecuador, France, Iceland, India, Italy and Nicaragua.

India's External Affairs Ministry spokesman Syed Akbaruddin said Delhi has carefully examined the asylum request and decided to turn it down. And Brazil's Foreign Ministry spokesman Tovar da Silva Nunes said the government "does not plan to respond" to the asylum request.

WikiLeaks also posted a statement attributed to Snowden on its website late Monday, in which he slams President Barack Obama for "using citizenship as a weapon."

"Although I am convicted of nothing, (the United States) has unilaterally revoked my passport, leaving me a stateless person," Snowden says in the statement. "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.

"Their purpose is to frighten, not me, but those who would come after me."

The Russian government says that Snowden, who has been on the run since releasing the sensitive NSA documents, has remained in the transit zone of Moscow's Sheremetyevo Airport since his arrival from Hong Kong on June 23.

Ecuador, where he had initially hoped to get asylum, has been giving mixed signals about offering him shelter.

Britain's Press Association news agency said it had obtained a letter from Snowden to Ecuadorean President Rafael Correa thanking him for considering his asylum request.

"There are few world leaders who would risk standing for the human rights of an individual against the most powerful government on earth, and the bravery of Ecuador and its people is an example to the world," PA quoted the letter as saying. The agency said it had obtained the Spanish-language letter from sources in Quito, the capital of Ecuador.

Correa, however, appeared cool to Snowden in an interview with the Guardian newspaper.

Asked whether he would like to meet Snowden, Correa was quoted as saying:  "Not particularly. He's a very complicated person. Strictly speaking, Mr. Snowden spied for some time."

He was quoted as saying that Ecuador would not consider an asylum request until Snowden was on its territory and his government would not help him travel to Ecuador.