Yuri Churbanov, son-in-law of the late Soviet leader Leonid Brezhnev, pleaded guilty Thursday to charges he abused his office as a top Interior Ministry official. Chubanov, however, told a military tribunal in Moscow he was innocent of the capital crime of accepting bribes. On the fourth day of a trial taken up almost entirely by the reading of 1,500 pages worth of corruption charges against Churbanov and eight co-defendants, Judge Mikhail Marov asked the principal defendant if he understood the charges. "Yes, they were understood," Churbanov replied, standing before the court. "I admit my guilt in abuse of office but don't admit my guilt in receiving bribes."