| State | RS Signed | Ratified | APIC Signed | Ratified |
|---|---|---|---|---|
| Albania | 18 Jul, 1998 | 31 Jan, 2003 | — | 02 Aug, 2006 |
| Bosnia and Herzegovina | 17 Jul, 2000 | 11 Apr, 2002 | — | 24 Jan, 2012 |
| Bulgaria | 11 Feb, 1999 | 11 Apr, 2002 | 02 May, 2003 | 28 Jul, 2006 |
| Croatia | 12 Oct, 1998 | 21 May, 2001 | 23 Sep, 2003 | 17 Dec, 2004 |
| Czech Republic | 13 Apr, 1999 | 21 Jul, 2009 | — | 04 May, 2011 |
| Estonia | 27 Dec, 1999 | 30 Jan, 2002 | 27 Jun, 2003 | 13 Sep, 2004 |
| Georgia | 18 Jul, 1998 | 05 Sep, 2003 | — | 10 Mar, 2010 |
| Hungary | 15 Jan, 1999 | 30 Nov, 2001 | 10 Sep, 2002 | 22 Mar, 2006 |
| Latvia | 22 Apr, 1999 | 28 Jun, 2002 | 29 Jun, 2004 | 23 Dec, 2004 |
| Lithuania | 10 Dec, 1998 | 12 May, 2003 | 25 May, 2004 | 30 Dec, 2004 |
| Moldova, Republic of | 08 Sep, 2000 | 12 Oct, 2010 | — | 17 May, 2017 |
| Montenegro | — | 23 Oct, 2006 | — | 23 Oct, 2006 |
| Poland | 09 Apr, 1999 | 12 Nov, 2001 | 30 Jun, 2004 | 10 Feb, 2009 |
| Romania | 07 Jul, 1999 | 11 Apr, 2002 | 30 Jun, 2004 | 17 Nov, 2005 |
| Serbia | 19 Dec, 2000 | 06 Sep, 2001 | 18 Jul, 2003 | 07 May, 2004 |
| Slovakia | 23 Dec, 1998 | 11 Apr, 2002 | 19 Dec, 2003 | 26 May, 2004 |
| Slovenia | 07 Oct, 1998 | 31 Dec, 2001 | 25 Sep, 2003 | 23 Sep, 2004 |
| The former Yugoslav Republic of Macedonia | 07 Oct, 1998 | 06 Mar, 2002 | — | 19 Oct, 2005 |