KIEV, September 7 - RAPSI. The Kiev Economic Court will hear on September 12 the Russian Defense Ministry's lawsuit against the Ukrainian Cabinet of Ministers for the recovery of $405 million in debt owed by the United Energy Systems of Ukraine (UESU), which was previously headed by former Prime Minister Yulia Tymoshenko, the United State Register of Court Decisions of Ukraine has reported on Friday.

The debt arose in the 1990s. The Ukrainian government was the guarantor under the debt.

Preliminary hearings were held on September 5, 2012. The Kiev Economic Court decided to join the State Treasury Service to the case as a second defendant and postponed its consideration for September 12.

Tymoshenko headed the UESU in the 1990s. In late March, a second case bringing further charges against Tymoshenko was filed with Kharkiv's Kievsky District Court. The case deals with her activity at the company. She has been accused of the misappropriation of funds.

In a separate case in October 2011, Tymoshenko was sentenced to seven years in prison for abuse of power based on a 2009 gas contract she signed with Russia. She is serving her sentence in a Kharkiv women's prison. She has been receiving treatment at a Kharkiv hospital since May 2012. She was diagnosed with a spinal disc herniation.