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.
Czechoslovak koruna
In 1993, on the dissolution of the Czechoslovak federation, the Czechoslovak koruna split into two independent currencies: the Slovak koruna and the Czech koruna. Accession to the EU in 2004 meant both currencies were slotted to be replaced by the euro once their respective countries met the criteria for economic convergence and there was the political will to do so. The Slovak koruna was replaced by the euro on 1 January 2009; there is currently no set or estimated date for the Czech koruna to be replaced.