Bolshoi Ballet star soloist Pavel Dmitrichenko pleaded not guilty Tuesday to masterminding an acid attack on the theater's artistic director, Sergei Filin, a court spokesman told CNN.
Alleged accomplice Yuri Zarutsky pleaded guilty to carrying out the attack, but he said he had acted alone.
A third defendant in the case, Andrei Lipatov, denied the charges. He's accused of aiding Zarutsky by acting as his driver.
Filin was walking up to his Moscow apartment in January when a masked assailant tossed sulfuric acid onto his face, leaving him severely burned and nearly blinded.
Proceedings were adjourned to Thursday after the three men heard and responded to the charges.
Filin has spent much of the past year in Germany, where doctors have been working to save his sight.
He has undergone multiple surgeries and has regained 80 percent of his vision in one eye, the state-run RIA Novosti news agency said. His other eye, in which he was completely blind after the attack, has not recovered to the same extent, but he can now pick out large objects, it said.
Filin recently returned to Moscow, but he still needs further treatment.
There's still a question mark over whether he will be able to return to his role at the Bolshoi Ballet, one of Russia's iconic cultural institutions.
The case has sparked great public interest in Russia, where tales of intrigue and bitter rivalries have swirled around the ballet's dancers and management.