Bolivia's President Evo Morales says his country has made a formal complaint to the United Nations after his plane was diverted in Europe.
Mr Morales has accused a number of European countries of denying entry to his jet as it flew back from Russia amid rumours the intelligence leaker Edward Snowden was on it.
Several South American leaders have spoken out in support of Mr Morales, and demonstrations have been held over his treatment.
Michael Kenny.
Bolivian officials have accused France, Portugal, Italy and Spain of denying entry to President Morales' jet out of fear of offending the United States.
US officials have confirmed the former contractor to the National Security Agency, Edward Snowden, is believed to be still in the transit area of Moscow airport.
He has been there since June the 23rd, trying to find a country that will offer him refuge from prosecution in the United States on espionage charges.
His leaks revealed a far-reaching intelligence program that collects data from US citizens' phone records and Internet use and also bugs European Union facilities, among others.
President Morales' plane was stranded at Vienna airport for several hours after a number of European countries refused to let it fly through their airspace.
Mr Morales says he felt humiliated, and he has accused the United States of colluding with its European allies to divert his plane for political purposes.
(Spanish, then translated:) "Of course, how can we have on our plane a person who is having problems with another country? Firstly, he never requested asylum nor refuge in our country. We are very responsible in what we do, and we are also very responsible as regards to international agreements."
Mr Morales' treatment triggered criticism from the leaders of Argentina, Ecuador, Uruguay and Venezuela, who agreed to hold a joint meeting to discuss the incident.
Argentina's President Cristina Fernandez says the diverting of his plane was an insult to all South Americans.
(Spanish, then translated:) "With his presidential, military plane, which has absolute and indisputable immunity and was illegally detained in Old Europe -- and when I say in Old Europe, I'm not just using a phrase -- remnants of colonialism that we thought we had been totally overcome, we believe, not only represent the humiliation of a sister country, but also of the South American continent."
In the Bolivian capital La Paz, about 100 demonstrators threw stones and burned a French flag outside the French embassy in protest over President Morales' treatment.
One of the protesters, Marcela Matias, said she felt bitter over the way her country had been treated on the world stage.
(Spanish, then translated:) "Indignation, indignation, because we are sovereign people, a people with dignity. It's not fair that some buffoons, like the government of the United States, come and impose conditions like colonial countries such as Spain, Italy and those who have trampled on Bolivia's dignity."
The international furore over Mr Snowden took a further twist when Ecuador said it had found a listening device in its London embassy and threatened to reveal who planted it.
Ecuador's Foreign Minister Ricardo Patino says the device was discovered a fortnight ago when he was in Britain to discuss the future of Wikileaks founder Julian Assange.
Meanwhile, the European Union has called on the United States to explain whether it has been spying on EU institutions.
It comes after a report in a German news magazine alleging U-S security authorities spied on EU buildings as part of the PRISM intelligence program exposed by Mr Snowden.
The European Commissioner for Justice and Fundamental Rights, Viviane Reding, has called on US officials to explain whether EU citizens have been targeted under PRISM.
And she wants to know how broad US access to the data would have been.
"It is a matter of concern, because it throws a shadow on the mutual trust, which is indispensable in relations between partners and allies."
The European Commission says it is uncertain about whether the dispute could affect the EU and US free-trade talks, set to begin in Washington on July the 8th.
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