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. Trial Begins for Former US Marine Accused of Espionage in Russia Charles Maynes MOSCOW - The long-awaited trial of a former U.S.Marine facing charges of espionage got underway in Moscow on Monday -- with U.S.officials accusing Russia of providing no evidence in a spy case that has provedan added irritant to already troubled relations between the two countries. Paul Whelan, 50, was arrested by FSB security agents in late December 2018 after allegedly accepting classified materials on a computerthumbdrive in a central Moscow hotel. Whelan has repeatedly denied those charges, insisting he was in Moscow for a friend's wedding and had accepted the drive from a Russian acquaintance without ever knowing or viewing its contents. The former Marine, who in addition to U.S.citizenship holds passports from the U.K., Canada and Ireland, also says he's been mistreated and denied medical treatment while in detention -- an assertion that U.S.officials have backed repeatedly and did so again Monday. U.S.Ambassador to Russia John J. Sullivan joined his counterparts from the U.K.and Ireland at the courtroom Monday, where the presiding judge allowed them to speak with Whelan briefly before closing the hearing to the public -- a standard practice in Russian-led "top secret" espionage cases. "It's a sad day for me as an American and a U.S.ambassador, in these circumstances, to come and see a citizen of my country held in such circumstances, with serious health problems unaddressed, with no evidence that's been produced to justify his incarceration for well over a year, and his inability to communicate with his family despite repeated requests by him and by me to the Russian government," said Sullivan, in a statement afterward to the press. "I am hoping that, as this process moves forward, we see a fair and transparent judicial process,"Sullivanadded. "Every person, every citizen, of every country in the world, deserves that." In turn, Russia'sforeignministry has accused Whelan of feigning illness -- part of what the ministry says is Whelan's playbook training as a U.S.intelligence officer after being caught "red-handed" by Russia's security services. If convicted on existing charges, Whelan faces the possibility of 10-20 years in prison. .