Czech Republic–Slovakia relations
Before 1918, both countries were part of Austria–Hungary. However, after the Ausgleich of 1867 Czechia belonged to the Austrian Empire while Slovakia belonged to the administratively separate Kingdom of Hungary, and between 1918 and December 31, 1992, both countries were part of Czechoslovakia. 
Both countries established diplomatic relations on January 1, 1993. These international relations are usually referred to or described as "very good", "cordial", and "above standard" in the media. When a Czech or Slovak president is inaugurated, very often his first international visit is to the former part of the common country. The same custom applies to newly elected prime ministers of the Czech Republic and Slovakia.
Slovak Republic (1939–1945)
The First Slovak Republic ceased to exist "de facto" on 4 April 1945 when the Red Army captured Bratislava and occupied all of Slovakia. "De jure" it ceased to exist when the exiled Slovak government capitulated to General Walton Walker leading the XX Corps of the 3rd US Army on 8 May 1945 in the Austrian town of Kremsmünster. In summer 1945, the captured former president and members of former government were handed over to Czechoslovak authorities.