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.
Czech and Slovak Federative Republic
After the fall of communism in 1989, Czechoslovakia adopted the official name Czech and Slovak Federative Republic (, ; ČSFR) during the period from 23 April 1990 until 31 December 1992, when the country was dissolved into the Czech Republic and Slovakia. This period is also referred to as the Fifth Czechoslovak Republic.