Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Brazil, Iran at Diplomatic Impasse Over US Sanctions Associated Press RIO DE JANEIRO - Brazil is entangled in a diplomatic spat that could potentially damage a long-standing commercial relationship with Iran, which is the biggest buyer of Brazilian corn. Seyed Ali Saqqayian, Iran's ambassador to Brasilia, was quoted Wednesday in Iran's semi-official Fars news agency saying that Tehran could reconsider imports from Brazil if it continues to refuse to refuel two Iranian vessels stranded there. The ships have been waiting off the coast of the southern state of Parana since early June. Brazil's state-run oil giant, Petrobras, has declined to supply fuel because it says the vessels are under U.S. sanctions and it would risk significant fines for doing so. .