Slovakia
The Slovak Republic and the Czech Republic went their separate ways after 1 January 1993, an event sometimes called the Velvet Divorce. Slovakia has remained a close partner with the Czech Republic. Both countries co-operate with Hungary and Poland in the Visegrád Group. Slovakia became a member of NATO on 29 March 2004 and of the European Union on 1 May 2004. On 1 January 2009, Slovakia adopted the Euro as its national currency.
Slovenia
Slovenia has a developed economy and is per capita the richest of the Slavic countries by nominal GDP, and the second richest by GDP (PPP) behind the Czech Republic. Slovenia was in the beginning of 2007 the first new member to introduce the euro as its currency, replacing the tolar. Since 2010, it has been member of the Organisation for Economic Co-operation and Development. There is a big difference in prosperity between the various regions. The economically wealthiest regions are the Central Slovenia region which includes the capital Ljubljana and the western Slovenian regions, as Goriška and Coastal–Karst, while the least wealthy regions are the Mura, the Central Sava and the Littoral–Inner Carniola.