In a meeting with Iran's President Mahmoud Ahmadinejad, Bolivia's visiting president pointed to the two countries' opposing stance against imperialism and said that his visit is 'a symbol of unity and solidarity among Iranian and Bolivian nations.'

"In addition to promoting political relations, this visit aims at enhancing bilateral ties in the fields of commerce, industry, agriculture, gas and oil," the Bolivian president added.

Iran-Bolivia overtures come as the United States has expressed grave concerns over the warming of relations between Iran and Latin American countries.

Tehran's gaining influnce in Latin America is meant to counter Washington's traditional influence in the region, Thomas Shannon the US assistant secretary of state for the Western Hemisphere told Reuters in May.

"The two revolutionary nations and the governments of Iran and Bolivia are natural allies and will remain supportive of one another under any circumstance," President Ahmadinejad said in his meeting with president Morales.

The United States accuses Iran of making effort to develop nuclear arms. This is while the UN nuclear watchdog has conceded the peaceful nature of Iran's nuclear program.

La Paz and Tehran established relations in September 2007 when signed trade and energy agreements along with a joint statement recognizing 'the rights of developing nations to develop nuclear energy for peaceful purposes.'

Iran enjoys strong relationship with Latin American countries including Venezuela, Cuba, Nicaragua and Bolivia as Washington has been trying to isolate Tehran in the international arena.

Latin America has been historically in the United States' "sphere of influence".