Richard A. Chichakli, a dual American and Syrian citizen, was convicted Friday of conspiring with the Russian arms trafficker Viktor Bout to buy aircraft in violation of sanctions imposed on them by the United States government. A federal jury in New York found Mr. Chichakli guilty of one count of conspiring to violate international sanctions, one count of conspiring to commit money laundering, one count of conspiring to commit wire fraud and six counts of wire fraud. Prosecutors said he deceived a Florida aviation company about his identity in an effort to sidestep a presidential executive order prohibiting him from conducting any business with American companies because he was a close associate of Mr. Bout, the leader of an international weapons smuggling ring. According to the government, Mr. Chichakli conspired with Mr. Bout to violate international sanctions in 2007 by trying to buy two Boeing aircraft for a foreign company that he and Mr. Bout operated together. Mr. Chichakli was arrested in Australia, where the authorities said he was living under an assumed name, and was extradited to New York in May. Mr. Bout, convicted in 2011, is serving a 25-year prison sentence for conspiring to sell weapons to a Colombian rebel group.