A high court in Ukraine will rule on August 29 on former Prime Minister Yulia Tymoshenko's appeal against her abuse-of-office conviction and seven-year prison sentence.
The government of President Viktor Yanukovych says an agreement Tymoshenko signed to buy gas from Russia undermined Ukraine's national interest.
Tymoshenko's lawyers argued in court this month that negotiating the gas agreement with Russia was a political act which did not amount to criminal action.
Tymoshenko says she is the victim of a political vendetta by Yanukovych, who narrowly beat her for the presidency in February 2010.
Tymoshenko, 51, has not attended the appeal trial herself, receiving treatment for back trouble in a state-run hospital since May.
In a separate trial, set to resume on September 11, Tymoshenko is accused of embezzlement and tax evasion.
Based on reporting by Reuters and AFP