All lounges at SVO are, technically, contract lounges. However, at least one of them is jointly owned by SU and DL: http://www.date.com.ru/index_eng.html

That lounge has a complimentary full-service bar, and the receptionist even kept in contact with the gate via radio to let me know when it was really time to go (the airport flight monitors were showing that the flight was boarding, when it was actually delayed).