KIEV, October 14 - RAPSI. The Ukrainian Security Service interrogated former Ukrainian Prime Minister Yulia Tymoshenko as part of a new criminal case filed against her on the attempted large-scale embezzlement of state funds, the Prosecutor General's Office said on Friday.

The case deals with a debt of $405 million, which Tymoshenko's United Energy Systems of Ukraine borrowed from the Russian Defense Ministry in the mid-1990s and never paid back.

The official spokesperson added that the next interrogation will be held on Monday.

The court sentenced Tymoshenko to seven years in prison on October 11 for abuse of office in connection with gas contracts signed in 2009 between Russia's Gazprom and Naftogaz of Ukraine. The new case concerns a $405 million debt of United Energy Systems of Ukraine (UESU) to the Russia's Defense Ministry in the 1990s. Tymoshenko headed the UESU from 1995-1997.

Russia closed a criminal case against Tymoshenko several years ago as the statute of limitations had expired.