The Kiev Appeals Court refused on Friday to accept an appeal against the arrest of former Ukrainian Prime Minister Yulia Tymoshenko.
"This [arrest] ruling cannot be appealed," Judge Olga Efimova said.
The former premier was detained on August 5 following a motion by prosecutors. She is accused of damaging Ukraine's national interests by signing "unfair" gas supply deals with Russia as prime minister in 2009 and faces up to 10 years in prison.
Currently Ukraine's leading opposition figure, Tymoshenko has denied all the charges against her, saying they are politically motivated.
Tymoshenko's lawyer Yury Sukhov described the Appeals Court decision as "absurd."
"We will turn to the Ukrainian Supreme Court today, but I think the decision will be the same as here because there is no justice in Ukraine," he said, adding that the case will "certainly be studied by the European Court on Human Rights."
