Historical clue formulations

• One of the Baltic States — 2018-08-13
• Where "hello" is "sveiks" — 2014-03-30
• Belarus neighbor — 2012-12-02
• 8-Down's home — 2010-10-24
• NATO member since 2004 — 2009-02-21
• Riga's land — 2009-02-09
• Neighbor of Belarus — 2005-05-29