Historical clue formulations

• The Baltics, once: Abbr. — 2021-08-21
• Ukr. and Lith., once — 2021-03-18
• Historical group of 15, for short — 2018-01-04
• They became independent in 1991: Abbr. — 2017-09-20
• Historical group of 15, for short — 2016-11-24
• 15 divs. on old maps — 2016-07-21
• Moldova and Belarus, once: Abbr. — 2015-11-26
• Ukraine and others, once: Abbr. — 2013-12-25
• Ukr., Est. and Lith., once — 2013-12-03
• Parts of Eastern Eur., once — 2013-08-04
• Georgia and neighbors, once: Abbr. — 2013-06-29
• Ukr. and Lith., once — 2013-05-22
• Lat. and Lith., formerly — 2012-10-03
• They broke up in 1991: Abbr. — 2012-08-04
• United entities before 1991: Abbr. — 2012-03-23
• Georgia and Moldova, once: Abbr. — 2012-01-22
• Armenia and Azerbaijan, once: Abbr. — 2011-06-06
• Cold war-era lands: Abbr. — 2011-04-06
• Lith. and Lat., once — 2011-02-02
• Members of a former union: Abbr. — 2011-01-13
• Cold war grp. — 2009-10-01
• Red grp. — 2009-06-06
• Red states?: Abbr. — 2009-02-08
• Bygone Black Sea borderers: Abbr. — 2009-02-07
• Part of Eastern Europe, once: Abbr. — 2008-08-21
• Former union members: Abbr. — 2008-07-25
• Bygone grp. of 15 — 2008-07-12
• Rus. and Ukr., once — 2008-02-24
• Communist federation: Abbr. — 2007-07-28
• Erstwhile grp. of 15 — 2007-05-25
• Georgia and others, once: Abbr. — 2007-02-18
• A lot of Eurasia, once: Abbr. — 2006-12-14
• Former grp. of 15 — 2006-08-19
• Georgia et al., once: Abbr. — 2006-08-16
• Cold war grp. — 2006-06-17
• Lith. and Ukr., formerly — 2006-06-12
• Old union members: Abbr. — 2006-06-02
• Lith. and Ukr., once — 2005-12-15
• Georgia and Lithuania, once: Abbr. — 2005-08-29
• The Baltics, once: Abbr. — 2005-06-26
• Independence achievers of 1991: Abbr. — 2005-04-26
• Pre-1989 Eurasian political divs. — 2004-10-03
• Lith. and Lat., once — 2004-05-04
• They broke up in 1991: Abbr. — 2004-03-12
• Lat. and others, once — 2003-11-14
• Ukr. and Lat., once — 2003-11-04
• Old Eurasian locales: Abbr. — 2003-08-09
• Georgia and others, once: Abbr. — 2003-08-08
• Former union members: Abbr. — 2003-07-20
• A great deal of Eurasia, once: Abbr. — 2003-06-14