The Moscow Arbitration Court ruled that an agreement making Yuganskneftegaz guarantor of a $1.6 billion loan to Yukos was illegal, Interfax reported from the courtroom.
State-controlled Rosneft bought Yugansk in December 2004, after the government seized and sold the unit of Yukos to recover tax claims.
Yukos is struggling to pay more than $30 billion back taxes and fines.
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Yukos Sub 1.6 bn Guarantee Illegal
Agreement making Yuganskneftegaz guarantor of a $1.6 billion loan to Yukos was illegal