A Moscow court has started a hearing into a complaint filed by Nadiya Savchenko, a Ukrainian air force pilot who is being held in Russia on charges of complicity in the deaths of two Russian journalists in eastern Ukraine.
Savchenko lodged a protest against a psychological examination conducted at a Moscow mental health facility.
The hearing was initially scheduled for October 27 but was postponed until November 11 because she was not brought to the courtroom from the hospital.
Court officials said the hearing was being held behind closed doors because it involves private information about Savchenko's health, court officials said.
Savchenko says she was captured by pro-Russian separatists in eastern Ukraine on June 18 and "illegally transferred" to Russian custody in July.
Investigators have said she was detained in Russia.
Savchenko won a seat in Ukraine's parliament last month.