Russian pilot Konstantin Yaroshenko, who is serving a 20-year sentence at the Fort Dix prison in the United States after being convicted of drug smuggling, was examined by doctors at the penitentiary once again, but the results of the medical check-up have not yet been made public, his lawyer Alexei Tarasov told Interfax on Thursday.

"During his last one-minute-long telephone conversation with his family, Konstantin said that he had undergone some medical tests, which, as far as I understood, were intended to check the functioning of his liver," Tarasov said.

"Any new information about the condition of his health is still absent. The Russian Embassy is also attempting to gain access to some documents, but it has so far been unable to do so," the lawyer said.

Yaroshenko, who has already used up his limit on paid phone calls from prison, was able to speak to his family very briefly, he added.

"If we are not informed of Yaroshenko's health within a week, we will lodge a complaint with the U.S. Northeast Correctional Center concerning the administration of the Fort Dix prison. Should our complaint be rejected, we will even go to the central department of corrections," Tarasov said.

U.S. correctional authorities may take three or four weeks to process such complaints, he said.

Yaroshenko was arrested in Liberia on May 28, 2010, on charges of plotting to transport a large amount of cocaine, and was then deported to the United States. On September 7, 2011 the Russian man was sentenced by a U.S. judge to 20 years in prison.

According to earlier reports, Yaroshenko's health deteriorated a couple of weeks ago. According to his relatives and lawyer, Yaroshenko is experiencing chest pain and has trouble breathing.

Lawyers to request a review of Konstantin Yaroshenko's U.S. conviction

The legal team representing Russian pilot Konstantin Yaroshenko, who was sentenced to 20 years in prison by a U.S. court after being convicted of smuggling a large haul of drugs, plans to lodge a request seeking a review of Yaroshenko's conviction. Read more>>>

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