Jailed Russian Opposition Leader Was Abused, Groups Say MOSCOW - Human rights officials said Tuesday that a jailed political opposition leader was held in a basement and denied food and water for more than two days and was forced to confess to charges of plotting mass riots in Russia, after being kidnapped from the streets of Kiev, Ukraine, where he had fled to avoid arrest. The opposition leader, Leonid Razvozzhayev, had visited a United Nations office in Kiev for advice on seeking political asylum. He disappeared on Friday while on a lunch break from a meeting with a lawyer and reappeared briefly on Sunday night outside a Moscow courthouse, where he shouted to a reporter that he had been tortured. Vladimir Markin, a spokesman for Russia's top federal investigator, has said that Mr. Razvozzhayev turned himself in and was in his "right mind" when he signed a lengthy confession. Russian authorities have accused Mr. Razvozzhayev and other opposition leaders of plotting mass riots and of seeking financing from Georgia to help topple the government of President Vladimir V. Putin, based on a documentary that was shown on the pro-Kremlin NTV channel this month. In an appearance on Tuesday evening on another channel, TV-Dozhd, human rights advocates who had visited Mr. Razvozzhayev in a Moscow detention center on Tuesday said that he told them the confession was coerced, and that he was handcuffed in a basement without food or water or use of a toilet. They said he was not beaten but was subjected to "psychological torture." Valery V. Borshchev, the head of the Public Oversight Commission and a member of the Moscow Helsinki Group, a human rights organization, said Mr. Razvozzhayev described being forced into a van in Kiev by four men and having a hood pulled over his head. Members of the Public Oversight Commission are supposed to have unrestricted access to prisons in Moscow, but officials said they had to argue for hours to see Mr. Razvozzhayev. On Monday, the Russian political opposition announced the results of three days of voting for a new leadership council; Mr. Razvozzhayev was among the 45 people elected to the new body.