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.
Vojtech Tuka
On 9 March 1939, Czech troops moved into Slovakia in reaction to radical calls for independence from Slovak patriots (including Tuka, who had recently been released from prison). On 13 March, Adolf Hitler took advantage of this "Homolov Putsch", prompting Jozef Tiso—the Slovak ex–prime minister and Roman Catholic priest deposed by the Czech troops—to declare Slovak independence on 14 March by an act of the Slovak Assembly. The Czech part of Czechoslovakia was incorporated into the Third Reich as a protectorate. Tiso became Prime Minister of the new Slovak state on 14 March 1939; he was chosen as President on 26 October 1939 and immediately appointed Tuka as Prime Minister.