Historical clue formulations

• Council, in Russian — 2025-12-05
• "Council," in Russian — 2025-05-11
• The first "S" in U.S.S.R. — 2019-02-04
• Like the first man-made space satellite — 2018-03-18
• Old political council — 2015-12-16
• It means "council" in Russian — 2014-07-04
• ___ Union — 2011-05-12
• Communist council — 2009-02-09
• Bygone political council — 2008-05-28
• Bygone council — 2007-08-23
• Part of U.S.S.R. — 2002-02-04
• With 49-Down, bygone alliance — 2001-08-08
• Bygone Russian group — 1997-05-26
• Defunct council — 1995-04-30